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rtpjpegpay: Allow U and V components to use different quant tables if they contain the same data

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This allows some cameras (Logitech C920) that specify different quant
tables but both with the same data, to work.
Bug reported by Robert Krakora
This commit is contained in:
Youness Alaoui 2012-05-15 20:58:25 +00:00 committed by Wim Taymans
parent 95f6e0dbe4
commit 7703a11073
1 changed files with 16 additions and 4 deletions
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20
gst/rtp/gstrtpjpegpay.c
View file

@ -417,7 +417,8 @@ no_table:
static gboolean
gst_rtp_jpeg_pay_read_sof (GstRtpJPEGPay * pay, const guint8 * data,
guint size, guint * offset, CompInfo info[])
guint size, guint * offset, CompInfo info[], RtpQuantTable tables[],
gulong tables_elements)
{
guint sof_size, off;
guint width, height, infolen;
@ -495,8 +496,18 @@ gst_rtp_jpeg_pay_read_sof (GstRtpJPEGPay * pay, const guint8 * data,
/* the other components are free to use any quant table but they have to
* have the same table id */
if (info[1].qt != info[2].qt)
goto invalid_comp;
if (info[1].qt != info[2].qt) {
/* Some MJPG (like the one from the Logitech C-920 camera) uses different
* quant tables for component 1 and 2 but both tables contain the exact
* same data, so we could consider them as being the same tables */
if (!(info[1].qt < tables_elements &&
info[2].qt < tables_elements &&
tables[info[1].qt].size > 0 &&
tables[info[1].qt].size == tables[info[2].qt].size &&
memcmp (tables[info[1].qt].data, tables[info[2].qt].data,
tables[info[1].qt].size) == 0))
goto invalid_comp;
}
return TRUE;
@ -648,7 +659,8 @@ gst_rtp_jpeg_pay_handle_buffer (GstRTPBasePayload * basepayload,
offset += gst_rtp_jpeg_pay_header_size (data, offset);
break;
case JPEG_MARKER_SOF:
if (!gst_rtp_jpeg_pay_read_sof (pay, data, size, &offset, info))
if (!gst_rtp_jpeg_pay_read_sof (pay, data, size, &offset, info, tables,
G_N_ELEMENTS (tables)))
goto invalid_format;
sof_found = TRUE;
break;