static int libdirac_decode_frame(AVCodecContext *avccontext,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
FfmpegDiracDecoderParams *p_dirac_params = avccontext->priv_data;
AVPicture *picture = data;
AVPicture pic;
int pict_size;
unsigned char *buffer[3];
*data_size = 0;
if (buf_size > 0) {
/* set data to decode into buffer */
dirac_buffer(p_dirac_params->p_decoder, buf, buf + buf_size);
if ((buf[4] & 0x08) == 0x08 && (buf[4] & 0x03))
avccontext->has_b_frames = 1;
}
while (1) {
/* parse data and process result */
DecoderState state = dirac_parse(p_dirac_params->p_decoder);
switch (state) {
case STATE_BUFFER:
return buf_size;
case STATE_SEQUENCE:
{
/* tell FFmpeg about sequence details */
dirac_sourceparams_t *src_params = &p_dirac_params->p_decoder->src_params;
if (av_image_check_size(src_params->width, src_params->height,
0, avccontext) < 0) {
av_log(avccontext, AV_LOG_ERROR, "Invalid dimensions (%dx%d)\n",
src_params->width, src_params->height);
avccontext->height = avccontext->width = 0;
return -1;
}
avccontext->height = src_params->height;
avccontext->width = src_params->width;
avccontext->pix_fmt = GetFfmpegChromaFormat(src_params->chroma);
if (avccontext->pix_fmt == PIX_FMT_NONE) {
av_log(avccontext, AV_LOG_ERROR,
"Dirac chroma format %d not supported currently\n",
src_params->chroma);
return -1;
}
avccontext->time_base.den = src_params->frame_rate.numerator;
avccontext->time_base.num = src_params->frame_rate.denominator;
/* calculate output dimensions */
avpicture_fill(&pic, NULL, avccontext->pix_fmt,
avccontext->width, avccontext->height);
pict_size = avpicture_get_size(avccontext->pix_fmt,
avccontext->width,
avccontext->height);
/* allocate output buffer */
if (!p_dirac_params->p_out_frame_buf)
p_dirac_params->p_out_frame_buf = av_malloc(pict_size);
buffer[0] = p_dirac_params->p_out_frame_buf;
buffer[1] = p_dirac_params->p_out_frame_buf +
pic.linesize[0] * avccontext->height;
buffer[2] = buffer[1] +
pic.linesize[1] * src_params->chroma_height;
/* tell Dirac about output destination */
dirac_set_buf(p_dirac_params->p_decoder, buffer, NULL);
break;
}
case STATE_SEQUENCE_END:
break;
case STATE_PICTURE_AVAIL:
/* fill picture with current buffer data from Dirac */
avpicture_fill(picture, p_dirac_params->p_out_frame_buf,
avccontext->pix_fmt,
avccontext->width, avccontext->height);
*data_size = sizeof(AVPicture);
return buf_size;
case STATE_INVALID:
return -1;
default:
break;
}
}
return buf_size;
}
static void DecodeDirac (const char *iname, const char *oname)
{
clock_t start_t, stop_t;
dirac_decoder_t *decoder = NULL;
FILE *ifp;
FILE *fpdata;
unsigned char buffer[8192];
int bytes = 0;
int num_frames = 0;
char infile_name[FILENAME_MAX];
char outfile_hdr[FILENAME_MAX];
char outfile_data[FILENAME_MAX];
dirac_decoder_state_t state = STATE_BUFFER;
strncpy(infile_name, iname, sizeof(infile_name));
strncpy(outfile_data, oname, sizeof(outfile_data));
if ((ifp = fopen (infile_name, "rb")) ==NULL)
{
perror(iname);
return;
}
if ((fpdata = fopen (outfile_data, "wb")) ==NULL)
{
perror(outfile_hdr);
fclose(ifp);
return;
}
/* initialise the decoder */
decoder = dirac_decoder_init(verbose);
assert (decoder != NULL);
start_t=clock();
do
{
/* parse the input data */
state = dirac_parse(decoder);
switch (state)
{
case STATE_BUFFER:
/*
* parser is out of data. Read data from input stream and pass it
* on to the parser
*/
bytes = fread (buffer, 1, sizeof(buffer), ifp);
if (bytes)
dirac_buffer (decoder, buffer, buffer + bytes);
break;
case STATE_SEQUENCE:
{
/*
* Start of sequence detected. Allocate for the frame buffers and
* pass this buffer to the parser
*/
unsigned char *buf[3];
if (verbose)
{
fprintf (stdout, "\nSEQUENCE : major_ver=%d minor_version=%d profile=%d level=%d width=%d height=%d chroma=%s chroma_width=%d chroma_height=%d frame_rate=%d/%d, source_sampling=%s topfieldfirst=%s",
decoder->parse_params.major_ver,
decoder->parse_params.minor_ver,
decoder->parse_params.profile,
decoder->parse_params.level,
decoder->src_params.width,
decoder->src_params.height,
chroma2string(decoder->src_params.chroma),
decoder->src_params.chroma_width,
decoder->src_params.chroma_height,
decoder->src_params.frame_rate.numerator,
decoder->src_params.frame_rate.denominator,
decoder->src_params.source_sampling == 0 ? "progressive" :
( decoder->src_params.source_sampling == 1 ? "interlaced" : "UNKNOWN" ),
decoder->src_params.topfieldfirst ? "yes" : "no");
}
FreeFrameBuffer(decoder);
buf[0] = buf[1] = buf[2] = 0;
buf[0] = (unsigned char *)malloc (decoder->src_params.width * decoder->src_params.height);
buf[1] = (unsigned char *)malloc (decoder->src_params.chroma_width * decoder->src_params.chroma_height);
buf[2] = (unsigned char *)malloc (decoder->src_params.chroma_width * decoder->src_params.chroma_height);
dirac_set_buf (decoder, buf, NULL);
}
break;
case STATE_SEQUENCE_END:
/*
* End of Sequence detected. Free the frame buffers
*/
if (verbose)
fprintf (stdout, "\nSEQUENCE_END");
FreeFrameBuffer(decoder);
break;
case STATE_PICTURE_AVAIL:
num_frames++;
if (verbose)
{
fprintf (stdout, "\nFRAME_AVAIL : frame_num=%d",
decoder->frame_num);
}
/* picture available for display */
if (!WritePicData(decoder, fpdata))
{
perror("Write failed");
goto cleanup;
}
break;
case STATE_INVALID:
/* Invalid state. Stop all processing */
fprintf (stderr, "Error processing file %s\n", iname);
break;
default:
continue;
}
} while (bytes > 0 && state != STATE_INVALID);
cleanup:
stop_t=clock();
if ( verbose )
fprintf (stdout, "\nTime per frame: %g",
(double)(stop_t-start_t)/(double)(CLOCKS_PER_SEC*num_frames));
fclose(fpdata);
fclose(ifp);
/* free all resources */
FreeFrameBuffer(decoder);
dirac_decoder_close(decoder);
}