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diracparse: make diracparse work correctly
This commit is contained in:
David Schleef
parent
ab1e013bb8
commit
f21e36b54b
2 changed files with 96 additions and 57 deletions
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@ -36,7 +36,9 @@
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#include <gst/gst.h>
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#include <gst/base/gstbytereader.h>
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#include <string.h>
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#include "gstdiracparse.h"
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#include "dirac_parse.h"
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/* prototypes */
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@ -190,6 +192,8 @@ gst_dirac_parse_finalize (GObject * object)
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static gboolean
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gst_dirac_parse_start (GstBaseParse * parse)
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{
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gst_base_parse_set_min_frame_size (parse, 13);
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return TRUE;
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}
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@ -206,102 +210,133 @@ gst_dirac_parse_set_sink_caps (GstBaseParse * parse, GstCaps * caps)
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return TRUE;
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}
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static gboolean
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gst_dirac_parse_frame_header (GstDiracParse * diracparse,
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GstBuffer * buffer, guint * framesize)
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{
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int next_header;
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next_header = GST_READ_UINT32_BE (GST_BUFFER_DATA (buffer) + 5);
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*framesize = next_header;
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return TRUE;
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}
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static gboolean
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gst_dirac_parse_check_valid_frame (GstBaseParse * parse,
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GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
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{
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GstByteReader reader = GST_BYTE_READER_INIT_FROM_BUFFER (frame->buffer);
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GstDiracParse *diracparse = GST_DIRAC_PARSE (parse);
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int off;
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guint32 next_header;
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gboolean lost_sync;
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gboolean draining;
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guint8 *data;
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int size;
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gboolean have_picture = FALSE;
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int offset;
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if (G_UNLIKELY (GST_BUFFER_SIZE (frame->buffer) < 13))
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data = GST_BUFFER_DATA (frame->buffer);
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size = GST_BUFFER_SIZE (frame->buffer);
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if (G_UNLIKELY (size < 13))
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return FALSE;
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off = gst_byte_reader_masked_scan_uint32 (&reader, 0xffffffff,
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0x42424344, 0, GST_BUFFER_SIZE (frame->buffer));
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GST_DEBUG ("%d: %02x %02x %02x %02x", size, data[0], data[1], data[2],
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data[3]);
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if (off < 0) {
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*skipsize = GST_BUFFER_SIZE (frame->buffer) - 3;
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return FALSE;
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}
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if (GST_READ_UINT32_BE (data) != 0x42424344) {
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off = gst_byte_reader_masked_scan_uint32 (&reader, 0xffffffff,
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0x42424344, 0, GST_BUFFER_SIZE (frame->buffer));
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GST_LOG_OBJECT (parse, "possible sync at buffer offset %d", off);
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if (off < 0) {
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*skipsize = GST_BUFFER_SIZE (frame->buffer) - 3;
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return FALSE;
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}
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if (off > 0) {
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GST_ERROR ("skipping %d", off);
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GST_LOG_OBJECT (parse, "possible sync at buffer offset %d", off);
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GST_DEBUG ("skipping %d", off);
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*skipsize = off;
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return FALSE;
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}
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if (!gst_dirac_parse_frame_header (diracparse, frame->buffer, framesize)) {
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GST_ERROR ("bad header");
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*skipsize = 3;
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return FALSE;
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}
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/* have sync, parse chunks */
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GST_LOG ("framesize %d", *framesize);
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offset = 0;
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while (!have_picture) {
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GST_DEBUG ("offset %d:", offset);
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lost_sync = GST_BASE_PARSE_LOST_SYNC (frame);
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draining = GST_BASE_PARSE_DRAINING (frame);
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if (lost_sync && !draining) {
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guint32 next_sync_word = 0;
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next_header = GST_READ_UINT32_BE (GST_BUFFER_DATA (frame->buffer) + 5);
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GST_LOG ("next header %d", next_header);
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if (!gst_byte_reader_skip (&reader, next_header) ||
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!gst_byte_reader_get_uint32_be (&reader, &next_sync_word)) {
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gst_base_parse_set_min_frame_size (parse, next_header + 4);
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*skipsize = 0;
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if (offset + 13 >= size) {
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*framesize = offset + 13;
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return FALSE;
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} else {
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if (next_sync_word != 0x42424344) {
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*skipsize = 3;
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return FALSE;
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} else {
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gst_base_parse_set_min_frame_size (parse, next_header);
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}
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}
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GST_DEBUG ("chunk type %02x", data[offset + 4]);
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if (GST_READ_UINT32_BE (data + offset) != 0x42424344) {
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GST_DEBUG ("bad header");
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*skipsize = 3;
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return FALSE;
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}
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next_header = GST_READ_UINT32_BE (data + offset + 5);
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GST_DEBUG ("next_header %d", next_header);
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if (next_header == 0)
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next_header = 13;
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if (SCHRO_PARSE_CODE_IS_PICTURE (data[offset + 4])) {
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have_picture = TRUE;
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}
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offset += next_header;
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if (offset >= size) {
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*framesize = offset;
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return FALSE;
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}
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}
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*framesize = offset;
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GST_DEBUG ("framesize %d", *framesize);
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return TRUE;
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}
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static GstFlowReturn
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gst_dirac_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
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{
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//GstDiracParse * diracparse = GST_DIRAC_PARSE (parse);
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GstDiracParse *diracparse = GST_DIRAC_PARSE (parse);
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guint8 *data;
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int size;
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/* Called when processing incoming buffers. Function should parse
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a checked frame. */
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/* MUST implement */
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if (GST_PAD_CAPS (GST_BASE_PARSE_SRC_PAD (parse)) == NULL) {
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GstCaps *caps = gst_caps_new_simple ("video/x-dirac", NULL);
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data = GST_BUFFER_DATA (frame->buffer);
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size = GST_BUFFER_SIZE (frame->buffer);
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gst_buffer_set_caps (frame->buffer, caps);
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gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (parse), caps);
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gst_caps_unref (caps);
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//GST_ERROR("got here %d", size);
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if (data[4] == SCHRO_PARSE_CODE_SEQUENCE_HEADER) {
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GstCaps *caps;
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DiracSequenceHeader sequence_header;
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int ret;
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ret = dirac_sequence_header_parse (&sequence_header, data + 13, size - 13);
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if (ret) {
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memcpy (&diracparse->sequence_header, &sequence_header,
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sizeof (sequence_header));
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caps = gst_caps_new_simple ("video/x-dirac",
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"width", G_TYPE_INT, sequence_header.width,
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"height", G_TYPE_INT, sequence_header.height,
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"framerate", GST_TYPE_FRACTION,
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sequence_header.frame_rate_numerator,
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sequence_header.frame_rate_denominator,
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"pixel-aspect-ratio", GST_TYPE_FRACTION,
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sequence_header.aspect_ratio_numerator,
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sequence_header.aspect_ratio_denominator,
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"interlaced", G_TYPE_BOOLEAN, sequence_header.interlaced,
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"profile", G_TYPE_INT, sequence_header.profile,
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"level", G_TYPE_INT, sequence_header.level, NULL);
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gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (parse), caps);
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gst_caps_unref (caps);
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gst_base_parse_set_frame_rate (parse,
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sequence_header.frame_rate_numerator,
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sequence_header.frame_rate_denominator, 0, 0);
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}
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}
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gst_buffer_set_caps (frame->buffer,
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GST_PAD_CAPS (GST_BASE_PARSE_SRC_PAD (parse)));
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gst_base_parse_set_min_frame_size (parse, 13);
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return GST_FLOW_OK;
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@ -22,6 +22,7 @@
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#include <gst/gst.h>
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#include <gst/base/gstbaseparse.h>
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#include "dirac_parse.h"
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G_BEGIN_DECLS
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@ -38,6 +39,9 @@ struct _GstDiracParse
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{
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GstBaseParse base_diracparse;
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DiracSequenceHeader sequence_header;
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guint32 frame_number;
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};
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struct _GstDiracParseClass
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