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| author | Baptiste Coudurier <baptiste.coudurier@gmail.com> | 2006-10-04 12:49:52 +0000 |
|---|---|---|
| committer | Baptiste Coudurier <baptiste.coudurier@gmail.com> | 2006-10-04 12:49:52 +0000 |
| commit | 2bb7875987877c213ff035f80d6f5ebc1d4d65b9 (patch) | |
| tree | c68bfcb087d4f2eee36420b76a9445cb2a33b601 /libavcodec/mjpeg.c | |
| parent | 938dd846930840078d26c58696052dc75ea073c8 (diff) | |
mjpeg 4:2:2 encoding support
Originally committed as revision 6550 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/mjpeg.c')
| -rw-r--r-- | libavcodec/mjpeg.c | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/libavcodec/mjpeg.c b/libavcodec/mjpeg.c index f0be96426e..61d0b6c10e 100644 --- a/libavcodec/mjpeg.c +++ b/libavcodec/mjpeg.c @@ -613,7 +613,7 @@ static void encode_block(MpegEncContext *s, DCTELEM *block, int n) uint16_t *huff_code_ac; /* DC coef */ - component = (n <= 3 ? 0 : n - 4 + 1); + component = (n <= 3 ? 0 : (n&1) + 1); dc = block[0]; /* overflow is impossible */ val = dc - s->last_dc[component]; if (n < 4) { @@ -666,9 +666,16 @@ void mjpeg_encode_mb(MpegEncContext *s, DCTELEM block[6][64]) { int i; - for(i=0;i<6;i++) { + for(i=0;i<5;i++) { encode_block(s, block[i], i); } + if (s->chroma_format == CHROMA_420) { + encode_block(s, block[5], 5); + } else { + encode_block(s, block[6], 6); + encode_block(s, block[5], 5); + encode_block(s, block[7], 7); + } } static int encode_picture_lossless(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){ @@ -1103,7 +1110,7 @@ static int mjpeg_decode_dht(MJpegDecodeContext *s) static int mjpeg_decode_sof(MJpegDecodeContext *s) { - int len, nb_components, i, width, height; + int len, nb_components, i, width, height, pix_fmt_id; /* XXX: verify len field validity */ len = get_bits(&s->gb, 16); @@ -1188,8 +1195,13 @@ static int mjpeg_decode_sof(MJpegDecodeContext *s) return 0; /* XXX: not complete test ! */ - switch((s->h_count[0] << 4) | s->v_count[0]) { - case 0x11: + pix_fmt_id = (s->h_count[0] << 20) | (s->v_count[0] << 16) | + (s->h_count[1] << 12) | (s->v_count[1] << 8) | + (s->h_count[2] << 4) | s->v_count[2]; + dprintf("pix fmt id %x\n", pix_fmt_id); + switch(pix_fmt_id){ + case 0x222222: + case 0x111111: if(s->rgb){ s->avctx->pix_fmt = PIX_FMT_RGBA32; }else if(s->nb_components==3) @@ -1197,11 +1209,12 @@ static int mjpeg_decode_sof(MJpegDecodeContext *s) else s->avctx->pix_fmt = PIX_FMT_GRAY8; break; - case 0x21: + case 0x211111: + case 0x221212: s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P; break; default: - case 0x22: + case 0x221111: s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P; break; } |