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Parse frames to feed the decoder with individual parse units.

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Patch by Anuradha Suraparaju anuradha rd bbc co uk
Original thread: [PATCH] Patches to fix issue453 individuallibdiracschroedinger
Date: 05/22/2008 04:26 AM

Originally committed as revision 14152 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Anuradha Suraparaju 2008-07-10 11:44:01 +00:00 committed by Benoit Fouet
parent eb64714c3a
commit 733cec1d73
1 changed files with 71 additions and 11 deletions
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82
libavcodec/libschroedingerdec.c
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@ -64,6 +64,60 @@ typedef struct FfmpegSchroDecoderParams
AVPicture dec_pic;
} FfmpegSchroDecoderParams;
typedef struct FfmpegSchroParseUnitContext
{
const uint8_t *buf;
int buf_size;
} FfmpegSchroParseUnitContext;
static void libschroedinger_decode_buffer_free (SchroBuffer *schro_buf,
void *priv);
static void FfmpegSchroParseContextInit (FfmpegSchroParseUnitContext *parse_ctx,
const uint8_t *buf, int buf_size)
{
parse_ctx->buf = buf;
parse_ctx->buf_size = buf_size;
}
static SchroBuffer* FfmpegFindNextSchroParseUnit (FfmpegSchroParseUnitContext *parse_ctx)
{
SchroBuffer *enc_buf = NULL;
int next_pu_offset = 0;
unsigned char *in_buf;
if (parse_ctx->buf_size < 13 ||
parse_ctx->buf[0] != 'B' ||
parse_ctx->buf[1] != 'B' ||
parse_ctx->buf[2] != 'C' ||
parse_ctx->buf[3] != 'D')
return NULL;
next_pu_offset = (parse_ctx->buf[5] << 24) +
(parse_ctx->buf[6] << 16) +
(parse_ctx->buf[7] << 8) +
parse_ctx->buf[8];
if (next_pu_offset == 0 &&
SCHRO_PARSE_CODE_IS_END_OF_SEQUENCE(parse_ctx->buf[4]))
next_pu_offset = 13;
if (next_pu_offset <= 0 || parse_ctx->buf_size < next_pu_offset)
return NULL;
in_buf = av_malloc(next_pu_offset);
memcpy (in_buf, parse_ctx->buf, next_pu_offset);
enc_buf = schro_buffer_new_with_data (in_buf, next_pu_offset);
enc_buf->free = libschroedinger_decode_buffer_free;
enc_buf->priv = in_buf;
parse_ctx->buf += next_pu_offset;
parse_ctx->buf_size -= next_pu_offset;
return enc_buf;
}
/**
* Returns FFmpeg chroma format.
*/
@ -164,26 +218,30 @@ static int libschroedinger_decode_frame(AVCodecContext *avccontext,
SchroFrame* frame;
int state;
int go = 1;
int outer = 1;
FfmpegSchroParseUnitContext parse_ctx;
*data_size = 0;
if (buf_size>0) {
unsigned char *in_buf = av_malloc(buf_size);
memcpy (in_buf, buf, buf_size);
enc_buf = schro_buffer_new_with_data (in_buf, buf_size);
enc_buf->free = libschroedinger_decode_buffer_free;
enc_buf->priv = in_buf;
/* Push buffer into decoder. */
state = schro_decoder_push (decoder, enc_buf);
if (state == SCHRO_DECODER_FIRST_ACCESS_UNIT)
libschroedinger_handle_first_access_unit(avccontext);
} else {
FfmpegSchroParseContextInit (&parse_ctx, buf, buf_size);
if (buf_size == 0) {
if (!p_schro_params->eos_signalled) {
state = schro_decoder_push_end_of_stream(decoder);
p_schro_params->eos_signalled = 1;
}
}
/* Loop through all the individual parse units in the input buffer */
do {
if ((enc_buf = FfmpegFindNextSchroParseUnit(&parse_ctx))) {
/* Push buffer into decoder. */
state = schro_decoder_push (decoder, enc_buf);
if (state == SCHRO_DECODER_FIRST_ACCESS_UNIT)
libschroedinger_handle_first_access_unit(avccontext);
go = 1;
}
else
outer = 0;
format = p_schro_params->format;
while (go) {
@ -224,6 +282,7 @@ static int libschroedinger_decode_frame(AVCodecContext *avccontext,
go = 0;
p_schro_params->eos_pulled = 1;
schro_decoder_reset (decoder);
outer = 0;
break;
case SCHRO_DECODER_ERROR:
@ -231,6 +290,7 @@ static int libschroedinger_decode_frame(AVCodecContext *avccontext,
break;
}
}
} while(outer);
/* Grab next frame to be returned from the top of the queue. */
frame = ff_dirac_schro_queue_pop(&p_schro_params->dec_frame_queue);