mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
* preAlpha DV encoding support -- there's still a truckload
of work to do, but it least people can try it out and share
ideas. Please don't hesitate to give it a spin:
$ ffmpeg -i file.avi file.dv
is all you need.
* fix for a deallocation bug in DV muxer
Originally committed as revision 2327 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Roman Shaposhnik
parent
c280f2d7c3
commit
4fa1c4fa8d
@ -1,4 +1,5 @@
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version <next>:
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- DV encoder, DV muxer
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- Microsoft RLE video decoder
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- Microsoft Video-1 decoder
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- Apple Video (RPZA) decoder
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@ -618,7 +618,7 @@ library:
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@item MPEG4 @tab X @tab X
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@tab MPEG4 is a variant of Quicktime
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@item Raw MPEG4 video @tab X @tab X
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@item DV @tab @tab X
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@item DV @tab X @tab X
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@item 4xm @tab @tab X
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@tab 4X Technologies format, used in some games
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@item Playstation STR @tab @tab X
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@ -668,7 +668,7 @@ following image formats are supported:
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@item WMV8 @tab X @tab X @tab Not completely working
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@item H263(+) @tab X @tab X @tab Also known as Real Video 1.0
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@item MJPEG @tab X @tab X
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@item DV @tab @tab X
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@item DV @tab X @tab X
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@item Huff YUV @tab X @tab X
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@item Asus v1 @tab X @tab X @tab fourcc: ASV1
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@item Asus v2 @tab X @tab X @tab fourcc: ASV2
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378
libavcodec/dv.c
378
libavcodec/dv.c
@ -2,6 +2,12 @@
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* DV decoder
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* Copyright (c) 2002 Fabrice Bellard.
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*
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* DV encoder
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* Copyright (c) 2003 Roman Shaposhnik.
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*
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* Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
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* of DV technical info.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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@ -19,7 +25,7 @@
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/**
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* @file dv.c
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* DV decoder.
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* DV codec.
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*/
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#include "avcodec.h"
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#include "dsputil.h"
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@ -72,7 +78,7 @@ static void dv_build_unquantize_tables(DVVideoDecodeContext *s)
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}
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}
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static int dvvideo_decode_init(AVCodecContext *avctx)
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static int dvvideo_init(AVCodecContext *avctx)
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{
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DVVideoDecodeContext *s = avctx->priv_data;
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MpegEncContext s2;
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@ -140,6 +146,10 @@ static int dvvideo_decode_init(AVCodecContext *avctx)
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/* XXX: do it only for constant case */
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dv_build_unquantize_tables(s);
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/* FIXME: I really don't think this should be here */
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if (dv_codec_profile(avctx))
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avctx->pix_fmt = dv_codec_profile(avctx)->pix_fmt;
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return 0;
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}
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@ -368,6 +378,9 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
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mb->pos = 0;
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mb->partial_bit_count = 0;
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#ifdef VLC_DEBUG
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printf("MB block: %d, %d ", mb_index, j);
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#endif
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dv_decode_ac(s, mb, block, last_index);
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/* write the remaining bits in a new buffer only if the
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@ -391,7 +404,7 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
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/* pass 2 : we can do it just after */
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#ifdef VLC_DEBUG
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printf("***pass 2 size=%d\n", mb_bit_count);
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printf("***pass 2 size=%d MB#=%d\n", mb_bit_count, mb_index);
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#endif
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block = block1;
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mb = mb1;
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@ -501,6 +514,317 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
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}
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}
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/* Converts run and level (where level != 0) pair into vlc, returning bit size */
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static inline int dv_rl2vlc(int run, int l, uint32_t* vlc)
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{
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int sign = l >> 8;
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int level = (l ^ sign) - sign;
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int size;
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sign = (sign & 1);
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if (run < 15 && level < 23 && dv_vlc_codes[run][level] != -1) {
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*vlc = (dv_vlc_bits[dv_vlc_codes[run][level]] << 1) | sign;
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size = dv_vlc_len[dv_vlc_codes[run][level]] + 1;
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}
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else {
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if (level < 23) {
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*vlc = (dv_vlc_bits[dv_vlc_codes[0][level]] << 1) | sign;
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size = dv_vlc_len[dv_vlc_codes[0][level]] + 1;
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} else {
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*vlc = 0xfe00 | (level << 1) | sign;
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size = 16;
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}
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switch(run) {
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case 0:
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break;
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case 1:
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case 2:
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*vlc |= ((0x7ce | (run - 1)) << size);
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size += 11;
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break;
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case 3:
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case 4:
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case 5:
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case 6:
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*vlc |= ((0xfac | (run - 3)) << size);
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size += 12;
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break;
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default:
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*vlc |= ((0x1f80 | (run - 1)) << size);
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size += 13;
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break;
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}
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}
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return size;
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}
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typedef struct EncBlockInfo {
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int qno;
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int cno;
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int dct_mode;
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int block_size;
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DCTELEM *mb;
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PutBitContext pb;
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} EncBlockInfo;
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static inline int dv_bits_left(EncBlockInfo* bi)
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{
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return (bi->block_size - get_bit_count(&bi->pb));
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}
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static inline void dv_encode_ac(EncBlockInfo* bi, PutBitContext* heap)
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{
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int i, level, size, run = 0;
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uint32_t vlc;
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PutBitContext* cpb = &bi->pb;
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for (i=1; i<64; i++) {
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level = bi->mb[ff_zigzag_direct[i]] /
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(1<<(dv_quant_shifts[bi->qno + dv_quant_offset[bi->cno]]
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[dv_88_areas[ff_zigzag_direct[i]]] + 4 + (bi->cno == 3)));
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if (level != 0) {
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size = dv_rl2vlc(run, level, &vlc);
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put_vlc:
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#ifdef VLC_DEBUG
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printf(" %3d:%3d", run, level);
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#endif
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if (cpb == &bi->pb && size > dv_bits_left(bi)) {
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size -= dv_bits_left(bi);
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put_bits(cpb, dv_bits_left(bi), vlc >> size);
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vlc = vlc & ((1<<size)-1);
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cpb = heap;
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}
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put_bits(cpb, size, vlc);
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run = 0;
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} else
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run++;
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}
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if (i == 64) {
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size = 4; vlc = 6; /* End Of Block stamp */
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goto put_vlc;
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}
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}
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static inline void dv_redistr_bits(EncBlockInfo* bi, int count, uint8_t* extra_data, int extra_bits, PutBitContext* heap)
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{
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int i;
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GetBitContext gb;
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init_get_bits(&gb, extra_data, extra_bits);
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for (i=0; i<count; i++) {
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int bits_left = dv_bits_left(bi);
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#ifdef VLC_DEBUG
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if (bits_left)
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printf("------------> inserting %d bytes in %d:%d\n", bits_left, i/6, i%6);
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#endif
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if (bits_left > extra_bits) {
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bit_copy(&bi->pb, &gb, extra_bits);
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extra_bits = 0;
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break;
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} else
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bit_copy(&bi->pb, &gb, bits_left);
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extra_bits -= bits_left;
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bi++;
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}
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if (extra_bits > 0 && heap)
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bit_copy(heap, &gb, extra_bits);
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}
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static inline void dv_set_class_number(EncBlockInfo* bi, int j)
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{
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int i, max_ac = 0;
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for (i=1; i<64; i++) {
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int ac = abs(bi->mb[ff_zigzag_direct[i]]) / 4;
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if (max_ac < ac)
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max_ac = ac;
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}
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if (max_ac < 12)
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bi->cno = j;
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else if (max_ac < 24)
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bi->cno = j + 1;
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else if (max_ac < 36)
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bi->cno = j + 2;
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else
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bi->cno = j + 3;
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if (bi->cno > 3)
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bi->cno = 3;
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}
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/*
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* This is a very rough initial implementaion. The performance is
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* horrible and some features are missing, mainly 2-4-8 DCT encoding.
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* The weighting is missing as well, but it's missing from the decoding
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* step also -- so at least we're on the same page with decoder ;-)
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*/
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static inline void dv_encode_video_segment(DVVideoDecodeContext *s,
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uint8_t *dif,
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const uint16_t *mb_pos_ptr)
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{
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int mb_index, i, j, v;
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int mb_x, mb_y, c_offset, linesize;
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uint8_t* y_ptr;
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uint8_t* data;
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int do_edge_wrap;
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DCTELEM *block;
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EncBlockInfo enc_blks[5*6];
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EncBlockInfo* enc_blk;
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int free_vs_bits;
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int extra_bits;
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PutBitContext extra_vs;
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uint8_t extra_vs_data[5*6*128];
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uint8_t extra_mb_data[6*128];
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int QNO = 15;
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/* Stage 1 -- doing DCT on 5 MBs */
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block = &s->block[0][0];
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for(mb_index = 0; mb_index < 5; mb_index++) {
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v = *mb_pos_ptr++;
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mb_x = v & 0xff;
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mb_y = v >> 8;
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y_ptr = s->picture.data[0] + (mb_y * s->picture.linesize[0] * 8) + (mb_x * 8);
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c_offset = (s->sys->pix_fmt == PIX_FMT_YUV411P) ?
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((mb_y * s->picture.linesize[1] * 8) + ((mb_x >> 2) * 8)) :
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(((mb_y >> 1) * s->picture.linesize[1] * 8) + ((mb_x >> 1) * 8));
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do_edge_wrap = 0;
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for(j = 0;j < 6; j++) {
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if (j < 4) { /* Four Y blocks */
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/* NOTE: at end of line, the macroblock is handled as 420 */
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if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x < (704 / 8)) {
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data = y_ptr + (j * 8);
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} else {
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data = y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->picture.linesize[0]);
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}
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linesize = s->picture.linesize[0];
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} else { /* Cr and Cb blocks */
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/* don't ask Fabrice why they inverted Cb and Cr ! */
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data = s->picture.data[6 - j] + c_offset;
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linesize = s->picture.linesize[6 - j];
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if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8))
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do_edge_wrap = 1;
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}
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/* Everything is set up -- now just copy data -> DCT block */
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if (do_edge_wrap) { /* Edge wrap copy: 4x16 -> 8x8 */
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uint8_t* d;
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DCTELEM *b = block;
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for (i=0;i<8;i++) {
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d = data + 8 * linesize;
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b[0] = data[0]; b[1] = data[1]; b[2] = data[2]; b[3] = data[3];
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b[4] = d[0]; b[5] = d[1]; b[6] = d[2]; b[7] = d[3];
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data += linesize;
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b += 8;
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}
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} else { /* Simple copy: 8x8 -> 8x8 */
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s->get_pixels(block, data, linesize);
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}
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s->fdct(block);
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block += 64;
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}
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}
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/* Stage 2 -- setup for encoding phase */
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enc_blk = &enc_blks[0];
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block = &s->block[0][0];
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for (i=0; i<5; i++) {
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for (j=0; j<6; j++) {
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enc_blk->mb = block;
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enc_blk->dct_mode = 0;
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enc_blk->block_size = block_sizes[j];
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dv_set_class_number(enc_blk, j/4*(j%2));
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block += 64;
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enc_blk++;
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}
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}
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/* Stage 3 -- encoding by trial-and-error */
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encode_vs:
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enc_blk = &enc_blks[0];
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for (i=0; i<5; i++) {
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uint8_t* p = dif + i*80 + 4;
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for (j=0; j<6; j++) {
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enc_blk->qno = QNO;
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init_put_bits(&enc_blk->pb, p, block_sizes[j]/8, NULL, NULL);
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enc_blk++;
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p += block_sizes[j]/8;
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}
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}
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init_put_bits(&extra_vs, extra_vs_data, sizeof(extra_vs_data), NULL, NULL);
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free_vs_bits = 0;
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enc_blk = &enc_blks[0];
|
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for (i=0; i<5; i++) {
|
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PutBitContext extra_mb;
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EncBlockInfo* enc_blk2 = enc_blk;
|
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int free_mb_bits = 0;
|
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|
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init_put_bits(&extra_mb, extra_mb_data, sizeof(extra_mb_data), NULL, NULL);
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dif[i*80 + 3] = enc_blk->qno;
|
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|
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for (j=0; j<6; j++) {
|
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uint16_t dc = ((enc_blk->mb[0] >> 3) - 1024) >> 2;
|
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|
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put_bits(&enc_blk->pb, 9, dc);
|
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put_bits(&enc_blk->pb, 1, enc_blk->dct_mode);
|
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put_bits(&enc_blk->pb, 2, enc_blk->cno);
|
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|
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#ifdef VLC_DEBUG
|
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printf("[%d, %d]: ", i, j);
|
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#endif
|
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dv_encode_ac(enc_blk, &extra_mb);
|
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#ifdef VLC_DEBUG
|
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printf("\n");
|
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#endif
|
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|
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free_mb_bits += dv_bits_left(enc_blk);
|
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enc_blk++;
|
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}
|
||||
|
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/* We can't flush extra_mb just yet -- since it'll round up bit number */
|
||||
extra_bits = get_bit_count(&extra_mb);
|
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if (free_mb_bits > extra_bits)
|
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free_vs_bits += free_mb_bits - extra_bits;
|
||||
|
||||
if (extra_bits) { /* FIXME: speed up things when free_mb_bits == 0 */
|
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flush_put_bits(&extra_mb);
|
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dv_redistr_bits(enc_blk2, 6, extra_mb_data, extra_bits, &extra_vs);
|
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}
|
||||
}
|
||||
|
||||
/* We can't flush extra_mb just yet -- since it'll round up bit number */
|
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extra_bits = get_bit_count(&extra_vs);
|
||||
if (extra_bits > free_vs_bits && QNO) { /* FIXME: very crude trial-and-error */
|
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QNO--;
|
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goto encode_vs;
|
||||
}
|
||||
|
||||
if (extra_bits) {
|
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flush_put_bits(&extra_vs);
|
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dv_redistr_bits(&enc_blks[0], 5*6, extra_vs_data, extra_bits, NULL);
|
||||
}
|
||||
|
||||
for (i=0; i<6*5; i++) {
|
||||
flush_put_bits(&enc_blks[i].pb);
|
||||
#ifdef VLC_DEBUG
|
||||
printf("[%d:%d] qno=%d cno=%d\n", i/6, i%6, enc_blks[i].qno, enc_blks[i].cno);
|
||||
#endif
|
||||
}
|
||||
}
|
||||
|
||||
/* NOTE: exactly one frame must be given (120000 bytes for NTSC,
|
||||
144000 bytes for PAL) */
|
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static int dvvideo_decode_frame(AVCodecContext *avctx,
|
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@ -535,6 +859,9 @@ static int dvvideo_decode_frame(AVCodecContext *avctx,
|
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if ((vs % 3) == 0)
|
||||
buf += 80; /* skip audio block */
|
||||
|
||||
#ifdef VLC_DEBUG
|
||||
printf("********************* %d, %d **********************\n", ds, vs);
|
||||
#endif
|
||||
dv_decode_video_segment(s, buf, mb_pos_ptr);
|
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buf += 5 * 80;
|
||||
mb_pos_ptr += 5;
|
||||
@ -550,10 +877,45 @@ static int dvvideo_decode_frame(AVCodecContext *avctx,
|
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return s->sys->frame_size;
|
||||
}
|
||||
|
||||
static int dvvideo_decode_end(AVCodecContext *avctx)
|
||||
static int dvvideo_encode_frame(AVCodecContext *c, uint8_t *buf, int buf_size,
|
||||
void *data)
|
||||
{
|
||||
DVVideoDecodeContext *s = c->priv_data;
|
||||
const uint16_t *mb_pos_ptr;
|
||||
int ds, vs;
|
||||
|
||||
s->sys = dv_codec_profile(c);
|
||||
if (!s->sys)
|
||||
return -1;
|
||||
|
||||
c->pix_fmt = s->sys->pix_fmt;
|
||||
s->picture = *((AVFrame *)data);
|
||||
|
||||
/* for each DIF segment */
|
||||
mb_pos_ptr = s->sys->video_place;
|
||||
for (ds = 0; ds < s->sys->difseg_size; ds++) {
|
||||
buf += 6 * 80; /* skip DIF segment header */
|
||||
|
||||
for(vs = 0; vs < 27; vs++) {
|
||||
if ((vs % 3) == 0)
|
||||
buf += 80; /* skip audio block */
|
||||
|
||||
#ifdef VLC_DEBUG
|
||||
printf("********************* %d, %d **********************\n", ds, vs);
|
||||
#endif
|
||||
dv_encode_video_segment(s, buf, mb_pos_ptr);
|
||||
buf += 5 * 80;
|
||||
mb_pos_ptr += 5;
|
||||
}
|
||||
}
|
||||
|
||||
emms_c();
|
||||
return s->sys->frame_size;
|
||||
}
|
||||
|
||||
static int dvvideo_end(AVCodecContext *avctx)
|
||||
{
|
||||
avcodec_default_free_buffers(avctx);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -562,9 +924,9 @@ AVCodec dvvideo_decoder = {
|
||||
CODEC_TYPE_VIDEO,
|
||||
CODEC_ID_DVVIDEO,
|
||||
sizeof(DVVideoDecodeContext),
|
||||
dvvideo_decode_init,
|
||||
NULL,
|
||||
dvvideo_decode_end,
|
||||
dvvideo_init,
|
||||
dvvideo_encode_frame,
|
||||
dvvideo_end,
|
||||
dvvideo_decode_frame,
|
||||
CODEC_CAP_DR1,
|
||||
NULL
|
||||
|
||||
@ -678,7 +678,6 @@ bail_out:
|
||||
void dv_delete_mux(DVMuxContext *c)
|
||||
{
|
||||
fifo_free(&c->audio_data);
|
||||
av_free(c);
|
||||
}
|
||||
|
||||
DVDemuxContext* dv_init_demux(AVFormatContext *s, int vid, int aid)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user