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gstreamer/gst/audioparsers/gstflacparse.c
Sebastian Dröge 09223cc719 flacparse: Optionally check the overall frame checksums too before accepting a frame as valid 
This is optional because it's a quite expensive operation and it's very
unlikely that a non-frame is detected as frame after the header CRC check
and checking all bits for valid values. The overall frame checksums are
mainly useful to detect inconsistencies in the encoded payload.
2010-03-26 18:58:35 +01:00

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/* GStreamer
*
* Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>.
* Copyright (C) 2009 Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>
* Copyright (C) 2009 Nokia Corporation. All rights reserved.
* Contact: Stefan Kost <stefan.kost@nokia.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-flacparse
* @see_also: flacdec, oggdemux, vorbisparse
*
* The flacparse element will parse the header packets of the FLAC
* stream and put them as the streamheader in the caps. This is used in the
* multifdsink case where you want to stream live FLAC streams to multiple
* clients, each client has to receive the streamheaders first before they can
* consume the FLAC packets.
*
* This element also makes sure that the buffers that it pushes out are properly
* timestamped and that their offset and offset_end are set. The buffers that
* flacparse outputs have all of the metadata that oggmux expects to receive,
* which allows you to (for example) remux an ogg/flac or convert a native FLAC
* format file to an ogg bitstream.
*
* <refsect2>
* <title>Example pipelines</title>
* |[
* gst-launch -v filesrc location=sine.flac ! flacparse ! identity \
* ! oggmux ! filesink location=sine-remuxed.ogg
* ]| This pipeline converts a native FLAC format file to an ogg bitstream.
* It also illustrates that the streamheader is set in the caps, and that each
* buffer has the timestamp, duration, offset, and offset_end set.
* </refsect2>
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstflacparse.h"
#include <string.h>
#include <gst/tag/tag.h>
#include <gst/audio/audio.h>
#include <gst/base/gstbitreader.h>
#include <gst/base/gstbytereader.h>
GST_DEBUG_CATEGORY_STATIC (flacparse_debug);
#define GST_CAT_DEFAULT flacparse_debug
/* CRC-8, poly = x^8 + x^2 + x^1 + x^0, init = 0 */
static const guint8 crc8_table[256] = {
0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15,
0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D,
0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65,
0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D,
0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5,
0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,
0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85,
0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD,
0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2,
0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,
0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2,
0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,
0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32,
0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A,
0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42,
0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A,
0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C,
0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,
0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC,
0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,
0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C,
0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44,
0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C,
0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,
0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B,
0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63,
0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B,
0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13,
0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB,
0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB,
0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3
};
static guint8
gst_flac_calculate_crc8 (const guint8 * data, guint length)
{
guint8 crc = 0;
while (length--) {
crc = crc8_table[crc ^ *data];
++data;
}
return crc;
}
/* CRC-16, poly = x^16 + x^15 + x^2 + x^0, init = 0 */
static const guint16 crc16_table[256] = {
0x0000, 0x8005, 0x800f, 0x000a, 0x801b, 0x001e, 0x0014, 0x8011,
0x8033, 0x0036, 0x003c, 0x8039, 0x0028, 0x802d, 0x8027, 0x0022,
0x8063, 0x0066, 0x006c, 0x8069, 0x0078, 0x807d, 0x8077, 0x0072,
0x0050, 0x8055, 0x805f, 0x005a, 0x804b, 0x004e, 0x0044, 0x8041,
0x80c3, 0x00c6, 0x00cc, 0x80c9, 0x00d8, 0x80dd, 0x80d7, 0x00d2,
0x00f0, 0x80f5, 0x80ff, 0x00fa, 0x80eb, 0x00ee, 0x00e4, 0x80e1,
0x00a0, 0x80a5, 0x80af, 0x00aa, 0x80bb, 0x00be, 0x00b4, 0x80b1,
0x8093, 0x0096, 0x009c, 0x8099, 0x0088, 0x808d, 0x8087, 0x0082,
0x8183, 0x0186, 0x018c, 0x8189, 0x0198, 0x819d, 0x8197, 0x0192,
0x01b0, 0x81b5, 0x81bf, 0x01ba, 0x81ab, 0x01ae, 0x01a4, 0x81a1,
0x01e0, 0x81e5, 0x81ef, 0x01ea, 0x81fb, 0x01fe, 0x01f4, 0x81f1,
0x81d3, 0x01d6, 0x01dc, 0x81d9, 0x01c8, 0x81cd, 0x81c7, 0x01c2,
0x0140, 0x8145, 0x814f, 0x014a, 0x815b, 0x015e, 0x0154, 0x8151,
0x8173, 0x0176, 0x017c, 0x8179, 0x0168, 0x816d, 0x8167, 0x0162,
0x8123, 0x0126, 0x012c, 0x8129, 0x0138, 0x813d, 0x8137, 0x0132,
0x0110, 0x8115, 0x811f, 0x011a, 0x810b, 0x010e, 0x0104, 0x8101,
0x8303, 0x0306, 0x030c, 0x8309, 0x0318, 0x831d, 0x8317, 0x0312,
0x0330, 0x8335, 0x833f, 0x033a, 0x832b, 0x032e, 0x0324, 0x8321,
0x0360, 0x8365, 0x836f, 0x036a, 0x837b, 0x037e, 0x0374, 0x8371,
0x8353, 0x0356, 0x035c, 0x8359, 0x0348, 0x834d, 0x8347, 0x0342,
0x03c0, 0x83c5, 0x83cf, 0x03ca, 0x83db, 0x03de, 0x03d4, 0x83d1,
0x83f3, 0x03f6, 0x03fc, 0x83f9, 0x03e8, 0x83ed, 0x83e7, 0x03e2,
0x83a3, 0x03a6, 0x03ac, 0x83a9, 0x03b8, 0x83bd, 0x83b7, 0x03b2,
0x0390, 0x8395, 0x839f, 0x039a, 0x838b, 0x038e, 0x0384, 0x8381,
0x0280, 0x8285, 0x828f, 0x028a, 0x829b, 0x029e, 0x0294, 0x8291,
0x82b3, 0x02b6, 0x02bc, 0x82b9, 0x02a8, 0x82ad, 0x82a7, 0x02a2,
0x82e3, 0x02e6, 0x02ec, 0x82e9, 0x02f8, 0x82fd, 0x82f7, 0x02f2,
0x02d0, 0x82d5, 0x82df, 0x02da, 0x82cb, 0x02ce, 0x02c4, 0x82c1,
0x8243, 0x0246, 0x024c, 0x8249, 0x0258, 0x825d, 0x8257, 0x0252,
0x0270, 0x8275, 0x827f, 0x027a, 0x826b, 0x026e, 0x0264, 0x8261,
0x0220, 0x8225, 0x822f, 0x022a, 0x823b, 0x023e, 0x0234, 0x8231,
0x8213, 0x0216, 0x021c, 0x8219, 0x0208, 0x820d, 0x8207, 0x0202
};
static guint16
gst_flac_calculate_crc16 (const guint8 * data, guint length)
{
guint16 crc = 0;
while (length--) {
crc = ((crc << 8) ^ crc16_table[(crc >> 8) ^ *data]) & 0xffff;
data++;
}
return crc;
}
enum
{
PROP_0,
PROP_CHECK_FRAME_CHECKSUMS
};
#define DEFAULT_CHECK_FRAME_CHECKSUMS FALSE
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-flac, framed = (boolean) true, "
"channels = (int) [ 1, 8 ], " "rate = (int) [ 1, 655350 ]")
);
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-flac, framed = (boolean) false")
);
static void gst_flac_parse_finalize (GObject * object);
static void gst_flac_parse_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_flac_parse_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_flac_parse_start (GstBaseParse * parse);
static gboolean gst_flac_parse_stop (GstBaseParse * parse);
static gboolean gst_flac_parse_check_valid_frame (GstBaseParse * parse,
GstBuffer * buffer, guint * framesize, gint * skipsize);
static GstFlowReturn gst_flac_parse_parse_frame (GstBaseParse * parse,
GstBuffer * buffer);
static gint gst_flac_parse_get_frame_overhead (GstBaseParse * parse,
GstBuffer * buffer);
GST_BOILERPLATE (GstFlacParse, gst_flac_parse, GstBaseParse,
GST_TYPE_BASE_PARSE);
static void
gst_flac_parse_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory));
gst_element_class_set_details_simple (element_class, "FLAC audio parser",
"Codec/Parser/Audio",
"Parses audio with the FLAC lossless audio codec",
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
GST_DEBUG_CATEGORY_INIT (flacparse_debug, "flacparse", 0,
"Flac parser element");
}
static void
gst_flac_parse_class_init (GstFlacParseClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstBaseParseClass *baseparse_class = GST_BASE_PARSE_CLASS (klass);
gobject_class->finalize = gst_flac_parse_finalize;
gobject_class->set_property = gst_flac_parse_set_property;
gobject_class->get_property = gst_flac_parse_get_property;
g_object_class_install_property (gobject_class, PROP_CHECK_FRAME_CHECKSUMS,
g_param_spec_boolean ("check-frame-checksums", "Check Frame Checksums",
"Check the overall checksums of every frame",
DEFAULT_CHECK_FRAME_CHECKSUMS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
baseparse_class->start = GST_DEBUG_FUNCPTR (gst_flac_parse_start);
baseparse_class->stop = GST_DEBUG_FUNCPTR (gst_flac_parse_stop);
baseparse_class->check_valid_frame =
GST_DEBUG_FUNCPTR (gst_flac_parse_check_valid_frame);
baseparse_class->parse_frame = GST_DEBUG_FUNCPTR (gst_flac_parse_parse_frame);
baseparse_class->get_frame_overhead =
GST_DEBUG_FUNCPTR (gst_flac_parse_get_frame_overhead);
}
static void
gst_flac_parse_init (GstFlacParse * flacparse, GstFlacParseClass * klass)
{
flacparse->check_frame_checksums = DEFAULT_CHECK_FRAME_CHECKSUMS;
}
static void
gst_flac_parse_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstFlacParse *flacparse = GST_FLAC_PARSE (object);
switch (prop_id) {
case PROP_CHECK_FRAME_CHECKSUMS:
flacparse->check_frame_checksums = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_flac_parse_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstFlacParse *flacparse = GST_FLAC_PARSE (object);
switch (prop_id) {
case PROP_CHECK_FRAME_CHECKSUMS:
g_value_set_boolean (value, flacparse->check_frame_checksums);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_flac_parse_finalize (GObject * object)
{
GstFlacParse *flacparse = GST_FLAC_PARSE (object);
if (flacparse->tags) {
gst_tag_list_free (flacparse->tags);
flacparse->tags = NULL;
}
g_list_foreach (flacparse->headers, (GFunc) gst_mini_object_unref, NULL);
g_list_free (flacparse->headers);
flacparse->headers = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_flac_parse_start (GstBaseParse * parse)
{
GstFlacParse *flacparse = GST_FLAC_PARSE (parse);
flacparse->state = GST_FLAC_PARSE_STATE_INIT;
flacparse->min_blocksize = 0;
flacparse->max_blocksize = 0;
flacparse->min_framesize = 0;
flacparse->max_framesize = 0;
flacparse->upstream_length = -1;
flacparse->samplerate = 0;
flacparse->channels = 0;
flacparse->bps = 0;
flacparse->total_samples = 0;
flacparse->requested_frame_size = 0;
flacparse->offset = GST_CLOCK_TIME_NONE;
flacparse->blocking_strategy = 0;
flacparse->block_size = 0;
flacparse->sample_number = 0;
/* "fLaC" marker */
gst_base_parse_set_min_frame_size (GST_BASE_PARSE (flacparse), 4);
return TRUE;
}
static gboolean
gst_flac_parse_stop (GstBaseParse * parse)
{
GstFlacParse *flacparse = GST_FLAC_PARSE (parse);
if (flacparse->tags) {
gst_tag_list_free (flacparse->tags);
flacparse->tags = NULL;
}
g_list_foreach (flacparse->headers, (GFunc) gst_mini_object_unref, NULL);
g_list_free (flacparse->headers);
flacparse->headers = NULL;
return TRUE;
}
static gint
gst_flac_parse_get_frame_size (GstFlacParse * flacparse, GstBuffer * buffer,
guint * framesize_ret)
{
GstBitReader reader = GST_BIT_READER_INIT_FROM_BUFFER (buffer);
guint16 samplerate;
guint8 tmp;
gint i;
guint8 channel_assignment = 0;
guint8 actual_crc, expected_crc;
/* Skip 14 bit sync code */
if (!gst_bit_reader_skip (&reader, 14))
goto need_more_data;
/* Must be 0 */
if (!gst_bit_reader_get_bits_uint8 (&reader, &tmp, 1))
goto need_more_data;
else if (tmp != 0)
goto error;
/* 0 == fixed block size, 1 == variable block size */
if (!gst_bit_reader_get_bits_uint8 (&reader, &flacparse->blocking_strategy,
1))
goto need_more_data;
/* block size index, calculation of the real blocksize below */
if (!gst_bit_reader_get_bits_uint16 (&reader, &flacparse->block_size, 4))
goto need_more_data;
else if (flacparse->block_size == 0)
goto error;
/* sample rate index, calculation of the real samplerate below */
if (!gst_bit_reader_get_bits_uint16 (&reader, &samplerate, 4))
goto need_more_data;
else if (samplerate == 0x0f)
goto error;
/* channel assignment */
if (!gst_bit_reader_get_bits_uint8 (&reader, &tmp, 4)) {
goto need_more_data;
} else if (tmp < 8) {
if (flacparse->channels && tmp + 1 != flacparse->channels)
goto error;
else
flacparse->channels = tmp + 1;
} else if (tmp <= 10) {
if (flacparse->channels && 2 != flacparse->channels)
goto error;
else
flacparse->channels = 2;
if (tmp == 8)
channel_assignment = 1; /* left-side */
else if (tmp == 9)
channel_assignment = 2; /* right-side */
else
channel_assignment = 3; /* mid-side */
} else if (tmp > 10) {
goto error;
}
/* bits per sample */
if (!gst_bit_reader_get_bits_uint8 (&reader, &tmp, 3)) {
goto need_more_data;
} else if (tmp == 0x03 || tmp == 0x07) {
goto error;
} else if (tmp == 0 && flacparse->bps == 0) {
goto need_streaminfo;
} else if (tmp == 0x01 && flacparse->bps != 8) {
if (flacparse->bps && flacparse->bps != 8)
goto error;
else
flacparse->bps = 8;
} else if (tmp == 0x02 && flacparse->bps != 12) {
if (flacparse->bps && flacparse->bps != 12)
goto error;
else
flacparse->bps = 12;
} else if (tmp == 0x04 && flacparse->bps != 16) {
if (flacparse->bps && flacparse->bps != 16)
goto error;
else
flacparse->bps = 16;
} else if (tmp == 0x05 && flacparse->bps != 20) {
if (flacparse->bps && flacparse->bps != 20)
goto error;
else
flacparse->bps = 20;
} else if (tmp == 0x06 && flacparse->bps != 24) {
if (flacparse->bps && flacparse->bps != 24)
goto error;
else
flacparse->bps = 24;
}
/* reserved, must be 0 */
if (!gst_bit_reader_get_bits_uint8 (&reader, &tmp, 1))
goto need_more_data;
else if (tmp != 0)
goto error;
/* read "utf8" encoded sample/frame number */
{
guint len = 0;
tmp = 1;
while (tmp != 0) {
if (!gst_bit_reader_get_bits_uint8 (&reader, &tmp, 1))
goto need_more_data;
else if (tmp == 1)
len++;
}
if (len == 1)
goto error;
flacparse->sample_number = 0;
if (len == 0) {
if (!gst_bit_reader_get_bits_uint8 (&reader, &tmp, 7))
goto need_more_data;
flacparse->sample_number = tmp;
} else if ((flacparse->blocking_strategy == 0 && len > 6) ||
(flacparse->blocking_strategy == 1 && len > 7)) {
goto error;
} else {
if (!gst_bit_reader_get_bits_uint8 (&reader, &tmp, 8 - len - 1))
goto need_more_data;
flacparse->sample_number = tmp;
len -= 1;
while (len > 0) {
if (!gst_bit_reader_get_bits_uint8 (&reader, &tmp, 2))
goto need_more_data;
else if (tmp != 0x02)
goto error;
if (!gst_bit_reader_get_bits_uint8 (&reader, &tmp, 6))
goto need_more_data;
flacparse->sample_number <<= 6;
flacparse->sample_number |= tmp;
len--;
}
}
}
/* calculate real blocksize from the blocksize index */
if (flacparse->block_size == 1)
flacparse->block_size = 192;
else if (flacparse->block_size <= 5)
flacparse->block_size = 576 * (1 << (flacparse->block_size - 2));
else if (flacparse->block_size <= 15)
flacparse->block_size = 256 * (1 << (flacparse->block_size - 8));
else if (flacparse->block_size == 6) {
if (!gst_bit_reader_get_bits_uint16 (&reader, &flacparse->block_size, 8))
goto need_more_data;
flacparse->block_size++;
} else if (flacparse->block_size == 7) {
if (!gst_bit_reader_get_bits_uint16 (&reader, &flacparse->block_size, 16))
goto need_more_data;
flacparse->block_size++;
}
/* calculate the real samplerate from the samplerate index */
if (samplerate == 0 && flacparse->samplerate == 0) {
goto need_streaminfo;
} else if (samplerate == 1) {
if (flacparse->samplerate == 0)
flacparse->samplerate = 88200;
else if (flacparse->samplerate != 88200)
goto error;
} else if (samplerate == 2) {
if (flacparse->samplerate == 0)
flacparse->samplerate = 176400;
else if (flacparse->samplerate != 176400)
goto error;
} else if (samplerate == 3) {
if (flacparse->samplerate == 0)
flacparse->samplerate = 192000;
else if (flacparse->samplerate != 192000)
goto error;
} else if (samplerate == 4) {
if (flacparse->samplerate == 0)
flacparse->samplerate = 8000;
else if (flacparse->samplerate != 8000)
goto error;
} else if (samplerate == 5) {
if (flacparse->samplerate == 0)
flacparse->samplerate = 16000;
else if (flacparse->samplerate != 16000)
goto error;
} else if (samplerate == 6) {
if (flacparse->samplerate == 0)
flacparse->samplerate = 22050;
else if (flacparse->samplerate != 22050)
goto error;
} else if (samplerate == 7) {
if (flacparse->samplerate == 0)
flacparse->samplerate = 24000;
else if (flacparse->samplerate != 24000)
goto error;
} else if (samplerate == 8) {
if (flacparse->samplerate == 0)
flacparse->samplerate = 32000;
else if (flacparse->samplerate != 32000)
goto error;
} else if (samplerate == 9) {
if (flacparse->samplerate == 0)
flacparse->samplerate = 44100;
else if (flacparse->samplerate != 44100)
goto error;
} else if (samplerate == 10) {
if (flacparse->samplerate == 0)
flacparse->samplerate = 48000;
else if (flacparse->samplerate != 48000)
goto error;
} else if (samplerate == 11) {
if (flacparse->samplerate == 0)
flacparse->samplerate = 96000;
else if (flacparse->samplerate != 96000)
goto error;
} else if (samplerate == 12) {
if (!gst_bit_reader_get_bits_uint16 (&reader, &samplerate, 8))
goto need_more_data;
samplerate *= 1000;
if (flacparse->samplerate == 0)
flacparse->samplerate = samplerate;
else if (flacparse->samplerate != samplerate)
goto error;
} else if (samplerate == 13) {
if (!gst_bit_reader_get_bits_uint16 (&reader, &samplerate, 16))
goto need_more_data;
if (flacparse->samplerate == 0)
flacparse->samplerate = samplerate;
else if (flacparse->samplerate != samplerate)
goto error;
} else if (samplerate == 14) {
if (!gst_bit_reader_get_bits_uint16 (&reader, &samplerate, 16))
goto need_more_data;
samplerate *= 10;
if (flacparse->samplerate == 0)
flacparse->samplerate = samplerate;
else if (flacparse->samplerate != samplerate)
goto error;
}
/* check crc-8 for the header */
if (!gst_bit_reader_get_bits_uint8 (&reader, &expected_crc, 8))
goto need_more_data;
actual_crc =
gst_flac_calculate_crc8 (GST_BUFFER_DATA (buffer),
(gst_bit_reader_get_pos (&reader) / 8) - 1);
if (actual_crc != expected_crc)
goto error;
/* parse subframes, one subframe per channel */
for (i = 0; i < flacparse->channels; i++) {
guint8 sf_type;
guint8 cur_bps;
cur_bps = flacparse->bps;
/* for mid/side, left/side, right/side the "difference" channel
* needs and additional bit */
if (i == 0 && channel_assignment == 2)
cur_bps++;
else if (i == 1 && (channel_assignment == 1 || channel_assignment == 3))
cur_bps++;
/* must be 0 */
if (!gst_bit_reader_get_bits_uint8 (&reader, &tmp, 1))
goto need_more_data;
else if (tmp != 0)
goto error;
/* sub frame type */
if (!gst_bit_reader_get_bits_uint8 (&reader, &sf_type, 6))
goto need_more_data;
else if (((sf_type & 0xfe) == 0x02) ||
((sf_type & 0xfc) == 0x04) ||
((sf_type & 0xf8) == 0x08 && (sf_type & 0x07) > 4) ||
((sf_type & 0xf0) == 0x10))
goto error;
/* wasted bits per sample, if 1 the value follows unary coded */
if (!gst_bit_reader_get_bits_uint8 (&reader, &tmp, 1)) {
goto need_more_data;
} else if (tmp != 0) {
guint wasted = 1;
tmp = 0;
while (tmp == 0) {
if (!gst_bit_reader_get_bits_uint8 (&reader, &tmp, 1))
goto need_more_data;
else
wasted++;
}
cur_bps -= wasted;
}
/* subframe type: constant */
if (sf_type == 0x00) {
if (!gst_bit_reader_skip (&reader, cur_bps))
goto need_more_data;
/* subframe type: verbatim */
} else if (sf_type == 0x01) {
if (!gst_bit_reader_skip (&reader, cur_bps * flacparse->block_size))
goto need_more_data;
/* subframe type: LPC or fixed */
} else {
guint8 residual_type;
guint order = 0;
guint16 partition_order;
guint j;
/* Skip warm-up samples for fixed subframe and calculate order */
if ((sf_type & 0xf8) == 0x08) {
order = sf_type & 0x07;
g_assert (order <= 4);
if (!gst_bit_reader_skip (&reader, cur_bps * order))
goto need_more_data;
/* Skip warm-up samples for LPC subframe, get parameters and calculate order */
} else if ((sf_type & 0xe0) == 0x20) {
guint8 prec;
order = (sf_type & 0x1f) + 1;
/* warm-up samples */
if (!gst_bit_reader_skip (&reader, cur_bps * order))
goto need_more_data;
/* LPC coefficient precision */
if (!gst_bit_reader_get_bits_uint8 (&reader, &prec, 4))
goto need_more_data;
else if (prec == 0x0f)
goto error;
prec++;
/* LPC coefficient shift */
if (!gst_bit_reader_skip (&reader, 5))
goto need_more_data;
/* LPC coefficients */
if (!gst_bit_reader_skip (&reader, order * prec))
goto need_more_data;
} else {
g_assert_not_reached ();
}
/* residual type: 0 == rice, 1 == rice2 */
if (!gst_bit_reader_get_bits_uint8 (&reader, &residual_type, 2))
goto need_more_data;
if (residual_type & 0x02)
goto error;
/* partition order */
if (!gst_bit_reader_get_bits_uint16 (&reader, &partition_order, 4))
goto need_more_data;
partition_order = 1 << partition_order;
/* 2^partition_order partitions */
for (j = 0; j < partition_order; j++) {
guint samples;
guint8 rice_parameter;
/* calculate number of samples for the current partition */
if (partition_order == 1) {
samples = flacparse->block_size - order;
} else if (j != 0) {
samples = flacparse->block_size / partition_order;
} else {
samples = flacparse->block_size / partition_order - order;
}
/* rice parameter */
if (!gst_bit_reader_get_bits_uint8 (&reader, &rice_parameter,
(residual_type == 0) ? 4 : 5))
goto need_more_data;
/* if rice parameter has all bits set the samples follow unencoded with the number of bits
* per sample in the following 5 bits */
if ((residual_type == 0 && rice_parameter == 0x0f)
|| (residual_type == 1 && rice_parameter == 0x1f)) {
if (!gst_bit_reader_get_bits_uint8 (&reader, &tmp, 5))
goto need_more_data;
if (!gst_bit_reader_skip (&reader, tmp * samples))
goto need_more_data;
} else {
guint k;
/* read the rice encoded samples */
for (k = 0; k < samples; k++) {
tmp = 0;
while (tmp == 0)
if (!gst_bit_reader_get_bits_uint8 (&reader, &tmp, 1))
goto need_more_data;
if (!gst_bit_reader_skip (&reader, rice_parameter))
goto need_more_data;
}
}
}
}
}
/* zero padding to byte alignment */
gst_bit_reader_skip_to_byte (&reader);
if (flacparse->check_frame_checksums) {
guint16 actual_crc16, expected_crc16;
if (!gst_bit_reader_get_bits_uint16 (&reader, &expected_crc16, 16))
goto need_more_data;
actual_crc16 =
gst_flac_calculate_crc16 (GST_BUFFER_DATA (buffer),
(gst_bit_reader_get_pos (&reader) / 8) - 2);
if (actual_crc16 != expected_crc16)
goto error;
} else {
/* Skip crc-16 for the complete frame */
if (!gst_bit_reader_skip (&reader, 16))
goto need_more_data;
}
*framesize_ret = gst_bit_reader_get_pos (&reader) / 8;
GST_DEBUG_OBJECT (flacparse, "Parsed frame at offset %" G_GUINT64_FORMAT ":\n"
"Frame size: %u\n"
"Block size: %u\n"
"Sample/Frame number: %" G_GUINT64_FORMAT,
flacparse->offset, *framesize_ret,
flacparse->block_size, flacparse->sample_number);
return 0;
need_more_data:
{
gint max;
/* not enough, if that was all available, give up on frame */
if (G_UNLIKELY (gst_base_parse_get_drain (GST_BASE_PARSE_CAST (flacparse))))
goto eos;
/* otherwise, ask for some more */
max = flacparse->max_framesize;
if (!max)
max = 1 << 24;
flacparse->requested_frame_size
= MIN (GST_BUFFER_SIZE (buffer) + 4096, max);
if (flacparse->requested_frame_size > GST_BUFFER_SIZE (buffer)) {
GST_DEBUG_OBJECT (flacparse, "Requesting %u bytes",
flacparse->requested_frame_size);
return flacparse->requested_frame_size;
} else {
GST_DEBUG_OBJECT (flacparse, "Giving up on invalid frame (%d bytes)",
GST_BUFFER_SIZE (buffer));
return -1;
}
}
need_streaminfo:
{
GST_ERROR_OBJECT (flacparse, "Need STREAMINFO");
return -2;
}
eos:
{
GST_WARNING_OBJECT (flacparse, "EOS");
return -1;
}
error:
{
GST_WARNING_OBJECT (flacparse, "Invalid frame");
return -1;
}
}
static gboolean
gst_flac_parse_check_valid_frame (GstBaseParse * parse, GstBuffer * buffer,
guint * framesize, gint * skipsize)
{
GstFlacParse *flacparse = GST_FLAC_PARSE (parse);
const guint8 *data = GST_BUFFER_DATA (buffer);
if (G_UNLIKELY (GST_BUFFER_SIZE (buffer) < 4))
return FALSE;
if (flacparse->state == GST_FLAC_PARSE_STATE_INIT) {
if (memcmp (GST_BUFFER_DATA (buffer), "fLaC", 4) == 0) {
GST_DEBUG_OBJECT (flacparse, "fLaC marker found");
*framesize = 4;
return TRUE;
} else if (data[0] == 0xff && (data[1] >> 2) == 0x3e) {
GST_DEBUG_OBJECT (flacparse, "Found headerless FLAC");
/* Minimal size of a frame header */
gst_base_parse_set_min_frame_size (GST_BASE_PARSE (flacparse), 16);
flacparse->requested_frame_size = 16;
flacparse->state = GST_FLAC_PARSE_STATE_GENERATE_HEADERS;
*skipsize = 0;
return FALSE;
} else {
GST_DEBUG_OBJECT (flacparse, "fLaC marker not found");
return FALSE;
}
} else if (flacparse->state == GST_FLAC_PARSE_STATE_HEADERS) {
guint size = 4 + ((data[1] << 16) | (data[2] << 8) | (data[3]));
GST_DEBUG_OBJECT (flacparse, "Found metadata block of size %u", size);
*framesize = size;
return TRUE;
} else {
if (data[0] == 0xff && (data[1] >> 2) == 0x3e) {
gint ret = 0;
flacparse->offset = GST_BUFFER_OFFSET (buffer);
flacparse->blocking_strategy = 0;
flacparse->block_size = 0;
flacparse->sample_number = 0;
GST_DEBUG_OBJECT (flacparse, "Found sync code");
ret = gst_flac_parse_get_frame_size (flacparse, buffer, framesize);
if (ret == 0) {
ret = *framesize;
/* if not in sync, also check for next frame header */
if (!gst_base_parse_get_sync (parse) &&
!gst_base_parse_get_drain (parse)) {
GST_DEBUG_OBJECT (flacparse, "Resyncing; checking next sync code");
if (GST_BUFFER_SIZE (buffer) >= ret + 2) {
if (data[ret] == 0xff && (data[ret + 1] >> 2) == 0x3e) {
GST_DEBUG_OBJECT (flacparse, "Found next sync code");
return TRUE;
} else {
GST_DEBUG_OBJECT (flacparse,
"No next sync code, rejecting frame");
return FALSE;
}
} else {
/* request more data for next sync */
GST_DEBUG_OBJECT (flacparse, "... but not enough data");
ret += 2;
gst_base_parse_set_min_frame_size (GST_BASE_PARSE (flacparse), ret);
flacparse->requested_frame_size = ret;
return FALSE;
}
}
return TRUE;
} else if (ret == -1) {
return FALSE;
} else if (ret == -2) {
GST_ELEMENT_ERROR (flacparse, STREAM, FORMAT, (NULL),
("Need STREAMINFO for parsing"));
return FALSE;
} else if (ret > 0) {
*skipsize = 0;
gst_base_parse_set_min_frame_size (GST_BASE_PARSE (flacparse), ret);
flacparse->requested_frame_size = ret;
return FALSE;
}
} else {
GstByteReader reader = GST_BYTE_READER_INIT_FROM_BUFFER (buffer);
gint off;
off = gst_byte_reader_masked_scan_uint32 (&reader, 0xfffc0000, 0xfff80000,
0, GST_BUFFER_SIZE (buffer));
if (off > 0) {
GST_DEBUG_OBJECT (parse, "Possible sync at buffer offset %d", off);
*skipsize = off;
return FALSE;
} else {
GST_DEBUG_OBJECT (flacparse, "Sync code not found");
*skipsize = GST_BUFFER_SIZE (buffer) - 3;
return FALSE;
}
}
}
return FALSE;
}
static gboolean
gst_flac_parse_handle_streaminfo (GstFlacParse * flacparse, GstBuffer * buffer)
{
GstBitReader reader = GST_BIT_READER_INIT_FROM_BUFFER (buffer);
if (GST_BUFFER_SIZE (buffer) != 4 + 34) {
GST_ERROR_OBJECT (flacparse, "Invalid metablock size for STREAMINFO: %u",
GST_BUFFER_SIZE (buffer));
return FALSE;
}
/* Skip metadata block header */
gst_bit_reader_skip (&reader, 32);
if (!gst_bit_reader_get_bits_uint16 (&reader, &flacparse->min_blocksize, 16))
goto error;
if (flacparse->min_blocksize < 16) {
GST_ERROR_OBJECT (flacparse, "Invalid minimum block size: %u",
flacparse->min_blocksize);
return FALSE;
}
if (!gst_bit_reader_get_bits_uint16 (&reader, &flacparse->max_blocksize, 16))
goto error;
if (flacparse->max_blocksize < 16) {
GST_ERROR_OBJECT (flacparse, "Invalid maximum block size: %u",
flacparse->max_blocksize);
return FALSE;
}
if (!gst_bit_reader_get_bits_uint32 (&reader, &flacparse->min_framesize, 24))
goto error;
if (!gst_bit_reader_get_bits_uint32 (&reader, &flacparse->max_framesize, 24))
goto error;
if (!gst_bit_reader_get_bits_uint32 (&reader, &flacparse->samplerate, 20))
goto error;
if (flacparse->samplerate == 0) {
GST_ERROR_OBJECT (flacparse, "Invalid sample rate 0");
return FALSE;
}
if (!gst_bit_reader_get_bits_uint8 (&reader, &flacparse->channels, 3))
goto error;
flacparse->channels++;
if (flacparse->channels > 8) {
GST_ERROR_OBJECT (flacparse, "Invalid number of channels %u",
flacparse->channels);
return FALSE;
}
if (!gst_bit_reader_get_bits_uint8 (&reader, &flacparse->bps, 5))
goto error;
flacparse->bps++;
if (!gst_bit_reader_get_bits_uint64 (&reader, &flacparse->total_samples, 36))
goto error;
if (flacparse->total_samples)
gst_base_parse_set_duration (GST_BASE_PARSE (flacparse), GST_FORMAT_TIME,
GST_FRAMES_TO_CLOCK_TIME (flacparse->total_samples,
flacparse->samplerate));
GST_DEBUG_OBJECT (flacparse, "STREAMINFO:\n"
"\tmin/max blocksize: %u/%u,\n"
"\tmin/max framesize: %u/%u,\n"
"\tsamplerate: %u,\n"
"\tchannels: %u,\n"
"\tbits per sample: %u,\n"
"\ttotal samples: %" G_GUINT64_FORMAT,
flacparse->min_blocksize, flacparse->max_blocksize,
flacparse->min_framesize, flacparse->max_framesize,
flacparse->samplerate,
flacparse->channels, flacparse->bps, flacparse->total_samples);
return TRUE;
error:
GST_ERROR_OBJECT (flacparse, "Failed to read data");
return FALSE;
}
static gboolean
gst_flac_parse_handle_vorbiscomment (GstFlacParse * flacparse,
GstBuffer * buffer)
{
flacparse->tags = gst_tag_list_from_vorbiscomment_buffer (buffer,
GST_BUFFER_DATA (buffer), 4, NULL);
if (flacparse->tags == NULL) {
GST_ERROR_OBJECT (flacparse, "Invalid vorbiscomment block");
} else if (gst_tag_list_is_empty (flacparse->tags)) {
gst_tag_list_free (flacparse->tags);
flacparse->tags = NULL;
}
return TRUE;
}
static gboolean
gst_flac_parse_handle_picture (GstFlacParse * flacparse, GstBuffer * buffer)
{
GstByteReader reader = GST_BYTE_READER_INIT_FROM_BUFFER (buffer);
const guint8 *data = GST_BUFFER_DATA (buffer);
guint32 img_len = 0, img_type = 0;
guint32 img_mimetype_len = 0, img_description_len = 0;
if (!gst_byte_reader_get_uint32_be (&reader, &img_type))
goto error;
if (!gst_byte_reader_get_uint32_be (&reader, &img_mimetype_len))
goto error;
if (!gst_byte_reader_skip (&reader, img_mimetype_len))
goto error;
if (!gst_byte_reader_get_uint32_be (&reader, &img_description_len))
goto error;
if (!gst_byte_reader_skip (&reader, img_description_len))
goto error;
if (!gst_byte_reader_skip (&reader, 4 * 4))
goto error;
if (!gst_byte_reader_get_uint32_be (&reader, &img_len))
goto error;
if (!flacparse->tags)
flacparse->tags = gst_tag_list_new ();
gst_tag_list_add_id3_image (flacparse->tags,
data + gst_byte_reader_get_pos (&reader), img_len, img_type);
if (gst_tag_list_is_empty (flacparse->tags)) {
gst_tag_list_free (flacparse->tags);
flacparse->tags = NULL;
}
return TRUE;
error:
GST_ERROR_OBJECT (flacparse, "Error reading data");
return FALSE;
}
static void
_value_array_append_buffer (GValue * array_val, GstBuffer * buf)
{
GValue value = { 0, };
g_value_init (&value, GST_TYPE_BUFFER);
/* copy buffer to avoid problems with circular refcounts */
buf = gst_buffer_copy (buf);
/* again, for good measure */
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_IN_CAPS);
gst_value_set_buffer (&value, buf);
gst_buffer_unref (buf);
gst_value_array_append_value (array_val, &value);
g_value_unset (&value);
}
static gboolean
gst_flac_parse_handle_headers (GstFlacParse * flacparse)
{
GstBuffer *vorbiscomment = NULL;
GstBuffer *streaminfo = NULL;
GstBuffer *marker = NULL;
GValue array = { 0, };
GstCaps *caps;
GList *l;
caps = gst_caps_new_simple ("audio/x-flac",
"channels", G_TYPE_INT, flacparse->channels,
"rate", G_TYPE_INT, flacparse->samplerate, NULL);
if (!flacparse->headers)
goto push_headers;
for (l = flacparse->headers; l; l = l->next) {
GstBuffer *header = l->data;
const guint8 *data = GST_BUFFER_DATA (header);
guint size = GST_BUFFER_SIZE (header);
GST_BUFFER_FLAG_SET (header, GST_BUFFER_FLAG_IN_CAPS);
if (size == 4 && memcmp (data, "fLaC", 4) == 0) {
marker = header;
} else if (size > 1 && (data[0] & 0x7f) == 0) {
streaminfo = header;
} else if (size > 1 && (data[0] & 0x7f) == 4) {
vorbiscomment = header;
}
}
if (marker == NULL || streaminfo == NULL || vorbiscomment == NULL) {
GST_WARNING_OBJECT (flacparse,
"missing header %p %p %p, muxing into container "
"formats may be broken", marker, streaminfo, vorbiscomment);
goto push_headers;
}
g_value_init (&array, GST_TYPE_ARRAY);
/* add marker including STREAMINFO header */
{
GstBuffer *buf;
guint16 num;
/* minus one for the marker that is merged with streaminfo here */
num = g_list_length (flacparse->headers) - 1;
buf = gst_buffer_new_and_alloc (13 + GST_BUFFER_SIZE (streaminfo));
GST_BUFFER_DATA (buf)[0] = 0x7f;
memcpy (GST_BUFFER_DATA (buf) + 1, "FLAC", 4);
GST_BUFFER_DATA (buf)[5] = 0x01; /* mapping version major */
GST_BUFFER_DATA (buf)[6] = 0x00; /* mapping version minor */
GST_BUFFER_DATA (buf)[7] = (num & 0xFF00) >> 8;
GST_BUFFER_DATA (buf)[8] = (num & 0x00FF) >> 0;
memcpy (GST_BUFFER_DATA (buf) + 9, "fLaC", 4);
memcpy (GST_BUFFER_DATA (buf) + 13, GST_BUFFER_DATA (streaminfo),
GST_BUFFER_SIZE (streaminfo));
_value_array_append_buffer (&array, buf);
gst_buffer_unref (buf);
}
/* add VORBISCOMMENT header */
_value_array_append_buffer (&array, vorbiscomment);
/* add other headers, if there are any */
for (l = flacparse->headers; l; l = l->next) {
if (GST_BUFFER_CAST (l->data) != marker &&
GST_BUFFER_CAST (l->data) != streaminfo &&
GST_BUFFER_CAST (l->data) != vorbiscomment) {
_value_array_append_buffer (&array, GST_BUFFER_CAST (l->data));
}
}
gst_structure_set_value (gst_caps_get_structure (caps, 0),
"streamheader", &array);
g_value_unset (&array);
push_headers:
gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (GST_BASE_PARSE (flacparse)), caps);
gst_caps_unref (caps);
/* push header buffers; update caps, so when we push the first buffer the
* negotiated caps will change to caps that include the streamheader field */
for (l = flacparse->headers; l != NULL; l = l->next) {
GstBuffer *buf = GST_BUFFER (l->data);
GstFlowReturn ret;
l->data = NULL;
buf = gst_buffer_make_metadata_writable (buf);
gst_buffer_set_caps (buf,
GST_PAD_CAPS (GST_BASE_PARSE_SRC_PAD (GST_BASE_PARSE (flacparse))));
ret = gst_base_parse_push_buffer (GST_BASE_PARSE (flacparse), buf);
if (ret != GST_FLOW_OK)
return FALSE;
}
g_list_free (flacparse->headers);
flacparse->headers = NULL;
/* Push tags */
if (flacparse->tags)
gst_element_found_tags (GST_ELEMENT (flacparse),
gst_tag_list_copy (flacparse->tags));
return TRUE;
}
static gboolean
gst_flac_parse_generate_headers (GstFlacParse * flacparse)
{
GstBuffer *marker, *streaminfo, *vorbiscomment;
guint8 *data;
marker = gst_buffer_new_and_alloc (4);
memcpy (GST_BUFFER_DATA (marker), "fLaC", 4);
GST_BUFFER_TIMESTAMP (marker) = GST_CLOCK_TIME_NONE;
GST_BUFFER_DURATION (marker) = GST_CLOCK_TIME_NONE;
GST_BUFFER_OFFSET (marker) = 0;
GST_BUFFER_OFFSET_END (marker) = 0;
flacparse->headers = g_list_append (flacparse->headers, marker);
streaminfo = gst_buffer_new_and_alloc (4 + 34);
data = GST_BUFFER_DATA (streaminfo);
memset (data, 0, 4 + 34);
/* metadata block header */
data[0] = 0x00; /* is_last = 0; type = 0; */
data[1] = 0x00; /* length = 34; */
data[2] = 0x00;
data[3] = 0x22;
/* streaminfo */
data[4] = (flacparse->block_size >> 8) & 0xff; /* min blocksize = blocksize; */
data[5] = (flacparse->block_size) & 0xff;
data[6] = (flacparse->block_size >> 8) & 0xff; /* max blocksize = blocksize; */
data[7] = (flacparse->block_size) & 0xff;
data[8] = 0x00; /* min framesize = 0; */
data[9] = 0x00;
data[10] = 0x00;
data[11] = 0x00; /* max framesize = 0; */
data[12] = 0x00;
data[13] = 0x00;
data[14] = (flacparse->samplerate >> 12) & 0xff;
data[15] = (flacparse->samplerate >> 4) & 0xff;
data[16] = (flacparse->samplerate >> 0) & 0xf0;
data[16] |= (flacparse->channels - 1) << 1;
data[16] |= ((flacparse->bps - 1) >> 4) & 0x01;
data[17] = (((flacparse->bps - 1)) & 0x0f) << 4;
{
gint64 duration;
GstFormat fmt = GST_FORMAT_TIME;
if (gst_pad_query_peer_duration (GST_BASE_PARSE_SINK_PAD (GST_BASE_PARSE
(flacparse)), &fmt, &duration) && fmt == GST_FORMAT_TIME) {
duration = GST_CLOCK_TIME_TO_FRAMES (duration, flacparse->samplerate);
data[17] |= (duration >> 32) & 0xff;
data[18] |= (duration >> 24) & 0xff;
data[19] |= (duration >> 16) & 0xff;
data[20] |= (duration >> 8) & 0xff;
data[21] |= (duration >> 0) & 0xff;
}
}
/* MD5 = 0; */
GST_BUFFER_TIMESTAMP (streaminfo) = GST_CLOCK_TIME_NONE;
GST_BUFFER_DURATION (streaminfo) = GST_CLOCK_TIME_NONE;
GST_BUFFER_OFFSET (streaminfo) = 0;
GST_BUFFER_OFFSET_END (streaminfo) = 0;
flacparse->headers = g_list_append (flacparse->headers, streaminfo);
/* empty vorbiscomment */
{
GstTagList *taglist = gst_tag_list_new ();
guchar header[4];
guint size;
header[0] = 0x84; /* is_last = 1; type = 4; */
vorbiscomment =
gst_tag_list_to_vorbiscomment_buffer (taglist, header, sizeof (header),
NULL);
gst_tag_list_free (taglist);
/* Get rid of framing bit */
if (GST_BUFFER_DATA (vorbiscomment)[GST_BUFFER_SIZE (vorbiscomment) - 1] ==
1) {
GstBuffer *sub;
sub =
gst_buffer_create_sub (vorbiscomment, 0,
GST_BUFFER_SIZE (vorbiscomment) - 1);
gst_buffer_unref (vorbiscomment);
vorbiscomment = sub;
}
size = GST_BUFFER_SIZE (vorbiscomment) - 4;
GST_BUFFER_DATA (vorbiscomment)[1] = ((size & 0xFF0000) >> 16);
GST_BUFFER_DATA (vorbiscomment)[2] = ((size & 0x00FF00) >> 8);
GST_BUFFER_DATA (vorbiscomment)[3] = (size & 0x0000FF);
GST_BUFFER_TIMESTAMP (vorbiscomment) = GST_CLOCK_TIME_NONE;
GST_BUFFER_DURATION (vorbiscomment) = GST_CLOCK_TIME_NONE;
GST_BUFFER_OFFSET (vorbiscomment) = 0;
GST_BUFFER_OFFSET_END (vorbiscomment) = 0;
flacparse->headers = g_list_append (flacparse->headers, vorbiscomment);
}
return TRUE;
}
static GstFlowReturn
gst_flac_parse_parse_frame (GstBaseParse * parse, GstBuffer * buffer)
{
GstFlacParse *flacparse = GST_FLAC_PARSE (parse);
const guint8 *data = GST_BUFFER_DATA (buffer);
if (flacparse->state == GST_FLAC_PARSE_STATE_INIT) {
GST_BUFFER_TIMESTAMP (buffer) = GST_CLOCK_TIME_NONE;
GST_BUFFER_DURATION (buffer) = GST_CLOCK_TIME_NONE;
GST_BUFFER_OFFSET (buffer) = 0;
GST_BUFFER_OFFSET_END (buffer) = 0;
/* 32 bits metadata block */
gst_base_parse_set_min_frame_size (GST_BASE_PARSE (flacparse), 4);
flacparse->state = GST_FLAC_PARSE_STATE_HEADERS;
flacparse->headers =
g_list_append (flacparse->headers, gst_buffer_ref (buffer));
return GST_BASE_PARSE_FLOW_DROPPED;
} else if (flacparse->state == GST_FLAC_PARSE_STATE_HEADERS) {
gboolean is_last = ((data[0] & 0x80) == 0x80);
guint type = (data[0] & 0x7F);
if (type == 127) {
GST_WARNING_OBJECT (flacparse, "Invalid metadata block type");
return GST_BASE_PARSE_FLOW_DROPPED;
}
GST_DEBUG_OBJECT (flacparse, "Handling metadata block of type %u", type);
switch (type) {
case 0: /* STREAMINFO */
if (!gst_flac_parse_handle_streaminfo (flacparse, buffer))
return GST_FLOW_ERROR;
break;
case 3: /* SEEKTABLE */
/* TODO: handle seektables */
break;
case 4: /* VORBIS_COMMENT */
if (!gst_flac_parse_handle_vorbiscomment (flacparse, buffer))
return GST_FLOW_ERROR;
break;
case 6: /* PICTURE */
if (!gst_flac_parse_handle_picture (flacparse, buffer))
return GST_FLOW_ERROR;
break;
case 1: /* PADDING */
case 2: /* APPLICATION */
case 5: /* CUESHEET */
default: /* RESERVED */
break;
}
GST_BUFFER_TIMESTAMP (buffer) = GST_CLOCK_TIME_NONE;
GST_BUFFER_DURATION (buffer) = GST_CLOCK_TIME_NONE;
GST_BUFFER_OFFSET (buffer) = 0;
GST_BUFFER_OFFSET_END (buffer) = 0;
if (is_last) {
flacparse->headers =
g_list_append (flacparse->headers, gst_buffer_ref (buffer));
if (!gst_flac_parse_handle_headers (flacparse))
return GST_FLOW_ERROR;
/* Minimal size of a frame header */
gst_base_parse_set_min_frame_size (GST_BASE_PARSE (flacparse), MAX (16,
flacparse->min_framesize));
flacparse->requested_frame_size = MAX (16, flacparse->min_framesize);
flacparse->state = GST_FLAC_PARSE_STATE_DATA;
/* DROPPED because we pushed all headers manually already */
return GST_BASE_PARSE_FLOW_DROPPED;
} else {
flacparse->headers =
g_list_append (flacparse->headers, gst_buffer_ref (buffer));
return GST_BASE_PARSE_FLOW_DROPPED;
}
} else {
if (flacparse->offset != GST_BUFFER_OFFSET (buffer)) {
gint ret;
guint framesize;
flacparse->offset = GST_BUFFER_OFFSET (buffer);
ret = gst_flac_parse_get_frame_size (flacparse, buffer, &framesize);
if (ret != 0) {
GST_ERROR_OBJECT (flacparse,
"Baseclass didn't provide a complete frame");
return GST_FLOW_ERROR;
}
}
if (flacparse->block_size == 0) {
GST_ERROR_OBJECT (flacparse, "Unparsed frame");
return GST_FLOW_ERROR;
}
if (flacparse->state == GST_FLAC_PARSE_STATE_GENERATE_HEADERS) {
if (flacparse->blocking_strategy == 1) {
GST_WARNING_OBJECT (flacparse,
"Generating headers for variable blocksize streams not supported");
if (!gst_flac_parse_handle_headers (flacparse))
return GST_FLOW_ERROR;
} else {
GST_DEBUG_OBJECT (flacparse, "Generating headers");
if (!gst_flac_parse_generate_headers (flacparse))
return GST_FLOW_ERROR;
if (!gst_flac_parse_handle_headers (flacparse))
return GST_FLOW_ERROR;
}
flacparse->state = GST_FLAC_PARSE_STATE_DATA;
}
/* also cater for oggmux metadata */
if (flacparse->blocking_strategy == 0) {
GST_BUFFER_TIMESTAMP (buffer) =
gst_util_uint64_scale (flacparse->sample_number,
flacparse->block_size * GST_SECOND, flacparse->samplerate);
GST_BUFFER_OFFSET_END (buffer) =
flacparse->sample_number * flacparse->block_size +
flacparse->block_size;
} else {
GST_BUFFER_TIMESTAMP (buffer) =
gst_util_uint64_scale (flacparse->sample_number, GST_SECOND,
flacparse->samplerate);
GST_BUFFER_OFFSET_END (buffer) =
flacparse->sample_number + flacparse->block_size;
}
GST_BUFFER_DURATION (buffer) =
GST_FRAMES_TO_CLOCK_TIME (flacparse->block_size, flacparse->samplerate);
GST_BUFFER_OFFSET (buffer) =
GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
/* Minimal size of a frame header */
gst_base_parse_set_min_frame_size (GST_BASE_PARSE (flacparse), MAX (16,
flacparse->min_framesize));
flacparse->requested_frame_size = MAX (16, flacparse->min_framesize);
flacparse->offset = -1;
flacparse->blocking_strategy = 0;
flacparse->block_size = 0;
flacparse->sample_number = 0;
return GST_FLOW_OK;
}
}
static gint
gst_flac_parse_get_frame_overhead (GstBaseParse * parse, GstBuffer * buffer)
{
GstFlacParse *flacparse = GST_FLAC_PARSE (parse);
if (flacparse->state != GST_FLAC_PARSE_STATE_DATA)
return -1;
else
/* To simplify, we just assume that it's a fixed size header and ignore
* subframe headers. The first could lead us to being off by 88 bits and
* the second even less, so the total inaccuracy is negligible. */
return 7;
}
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