static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
{
AVStream *st = s->streams[pkt->stream_index];
AVIOContext *pb = s->pb;
AVPicture *picture;
int* first_pkt = s->priv_data;
int width, height, h_chroma_shift, v_chroma_shift;
int i;
char buf2[Y4M_LINE_MAX + 1];
char buf1[20];
uint8_t *ptr, *ptr1, *ptr2;
picture = (AVPicture *)pkt->data;
/* for the first packet we have to output the header as well */
if (*first_pkt) {
*first_pkt = 0;
if (yuv4_generate_header(s, buf2) < 0) {
av_log(s, AV_LOG_ERROR,
"Error. YUV4MPEG stream header write failed.\n");
return AVERROR(EIO);
} else {
avio_write(pb, buf2, strlen(buf2));
}
}
/* construct frame header */
snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
avio_write(pb, buf1, strlen(buf1));
width = st->codec->width;
height = st->codec->height;
ptr = picture->data[0];
for (i = 0; i < height; i++) {
avio_write(pb, ptr, width);
ptr += picture->linesize[0];
}
if (st->codec->pix_fmt != AV_PIX_FMT_GRAY8) {
// Adjust for smaller Cb and Cr planes
avcodec_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift,
&v_chroma_shift);
width >>= h_chroma_shift;
height >>= v_chroma_shift;
ptr1 = picture->data[1];
ptr2 = picture->data[2];
for (i = 0; i < height; i++) { /* Cb */
avio_write(pb, ptr1, width);
ptr1 += picture->linesize[1];
}
for (i = 0; i < height; i++) { /* Cr */
avio_write(pb, ptr2, width);
ptr2 += picture->linesize[2];
}
}
static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
{
AVStream *st = s->streams[pkt->stream_index];
AVIOContext *pb = s->pb;
AVFrame *frame;
int* first_pkt = s->priv_data;
int width, height, h_chroma_shift, v_chroma_shift;
int i;
char buf2[Y4M_LINE_MAX + 1];
uint8_t *ptr, *ptr1, *ptr2;
frame = (AVFrame *)pkt->data;
/* for the first packet we have to output the header as well */
if (*first_pkt) {
*first_pkt = 0;
if (yuv4_generate_header(s, buf2) < 0) {
av_log(s, AV_LOG_ERROR,
"Error. YUV4MPEG stream header write failed.\n");
return AVERROR(EIO);
} else {
avio_write(pb, buf2, strlen(buf2));
}
}
/* construct frame header */
avio_printf(s->pb, "%s\n", Y4M_FRAME_MAGIC);
width = st->codec->width;
height = st->codec->height;
ptr = frame->data[0];
switch (st->codec->pix_fmt) {
case AV_PIX_FMT_GRAY8:
case AV_PIX_FMT_YUV411P:
case AV_PIX_FMT_YUV420P:
case AV_PIX_FMT_YUV422P:
case AV_PIX_FMT_YUV444P:
break;
case AV_PIX_FMT_GRAY16:
case AV_PIX_FMT_YUV420P9:
case AV_PIX_FMT_YUV422P9:
case AV_PIX_FMT_YUV444P9:
case AV_PIX_FMT_YUV420P10:
case AV_PIX_FMT_YUV422P10:
case AV_PIX_FMT_YUV444P10:
case AV_PIX_FMT_YUV420P12:
case AV_PIX_FMT_YUV422P12:
case AV_PIX_FMT_YUV444P12:
case AV_PIX_FMT_YUV420P14:
case AV_PIX_FMT_YUV422P14:
case AV_PIX_FMT_YUV444P14:
case AV_PIX_FMT_YUV420P16:
case AV_PIX_FMT_YUV422P16:
case AV_PIX_FMT_YUV444P16:
width *= 2;
break;
default:
av_log(s, AV_LOG_ERROR, "The pixel format '%s' is not supported.\n",
av_get_pix_fmt_name(st->codec->pix_fmt));
return AVERROR(EINVAL);
}
for (i = 0; i < height; i++) {
avio_write(pb, ptr, width);
ptr += frame->linesize[0];
}
if (st->codec->pix_fmt != AV_PIX_FMT_GRAY8 &&
st->codec->pix_fmt != AV_PIX_FMT_GRAY16) {
// Adjust for smaller Cb and Cr planes
av_pix_fmt_get_chroma_sub_sample(st->codec->pix_fmt, &h_chroma_shift,
&v_chroma_shift);
width = FF_CEIL_RSHIFT(width, h_chroma_shift);
height = FF_CEIL_RSHIFT(height, v_chroma_shift);
ptr1 = frame->data[1];
ptr2 = frame->data[2];
for (i = 0; i < height; i++) { /* Cb */
avio_write(pb, ptr1, width);
ptr1 += frame->linesize[1];
}
for (i = 0; i < height; i++) { /* Cr */
avio_write(pb, ptr2, width);
ptr2 += frame->linesize[2];
}
}
return 0;
}
