mirror of https://git.ffmpeg.org/ffmpeg.git
248 lines
8.1 KiB
C
248 lines
8.1 KiB
C
/*
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* MJPEG encoder
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* Copyright (c) 2000, 2001 Fabrice Bellard
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* Copyright (c) 2003 Alex Beregszaszi
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* Copyright (c) 2003-2004 Michael Niedermayer
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*
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* Support for external huffman table, various fixes (AVID workaround),
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* aspecting, new decode_frame mechanism and apple mjpeg-b support
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* by Alex Beregszaszi
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* MJPEG encoder.
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*/
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#include "libavutil/pixdesc.h"
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#include "avcodec.h"
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#include "mjpegenc_common.h"
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#include "mpegvideo.h"
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#include "mjpeg.h"
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#include "mjpegenc.h"
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av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
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{
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MJpegContext *m;
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if (s->width > 65500 || s->height > 65500) {
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av_log(s, AV_LOG_ERROR, "JPEG does not support resolutions above 65500x65500\n");
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return AVERROR(EINVAL);
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}
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m = av_malloc(sizeof(MJpegContext));
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if (!m)
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return AVERROR(ENOMEM);
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s->min_qcoeff=-1023;
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s->max_qcoeff= 1023;
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/* build all the huffman tables */
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ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance,
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m->huff_code_dc_luminance,
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avpriv_mjpeg_bits_dc_luminance,
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avpriv_mjpeg_val_dc);
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ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
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m->huff_code_dc_chrominance,
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avpriv_mjpeg_bits_dc_chrominance,
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avpriv_mjpeg_val_dc);
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ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
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m->huff_code_ac_luminance,
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avpriv_mjpeg_bits_ac_luminance,
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avpriv_mjpeg_val_ac_luminance);
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ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
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m->huff_code_ac_chrominance,
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avpriv_mjpeg_bits_ac_chrominance,
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avpriv_mjpeg_val_ac_chrominance);
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s->mjpeg_ctx = m;
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return 0;
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}
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void ff_mjpeg_encode_close(MpegEncContext *s)
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{
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av_free(s->mjpeg_ctx);
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}
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static void encode_block(MpegEncContext *s, int16_t *block, int n)
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{
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int mant, nbits, code, i, j;
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int component, dc, run, last_index, val;
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MJpegContext *m = s->mjpeg_ctx;
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uint8_t *huff_size_ac;
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uint16_t *huff_code_ac;
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/* DC coef */
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component = (n <= 3 ? 0 : (n&1) + 1);
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dc = block[0]; /* overflow is impossible */
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val = dc - s->last_dc[component];
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if (n < 4) {
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ff_mjpeg_encode_dc(&s->pb, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
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huff_size_ac = m->huff_size_ac_luminance;
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huff_code_ac = m->huff_code_ac_luminance;
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} else {
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ff_mjpeg_encode_dc(&s->pb, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
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huff_size_ac = m->huff_size_ac_chrominance;
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huff_code_ac = m->huff_code_ac_chrominance;
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}
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s->last_dc[component] = dc;
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/* AC coefs */
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run = 0;
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last_index = s->block_last_index[n];
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for(i=1;i<=last_index;i++) {
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j = s->intra_scantable.permutated[i];
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val = block[j];
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if (val == 0) {
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run++;
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} else {
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while (run >= 16) {
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put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
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run -= 16;
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}
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mant = val;
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if (val < 0) {
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val = -val;
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mant--;
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}
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nbits= av_log2_16bit(val) + 1;
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code = (run << 4) | nbits;
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put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
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put_sbits(&s->pb, nbits, mant);
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run = 0;
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}
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}
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/* output EOB only if not already 64 values */
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if (last_index < 63 || run != 0)
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put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
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}
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void ff_mjpeg_encode_mb(MpegEncContext *s, int16_t block[12][64])
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{
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int i;
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if (s->chroma_format == CHROMA_444) {
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encode_block(s, block[0], 0);
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encode_block(s, block[2], 2);
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encode_block(s, block[4], 4);
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encode_block(s, block[8], 8);
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encode_block(s, block[5], 5);
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encode_block(s, block[9], 9);
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if (16*s->mb_x+8 < s->width) {
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encode_block(s, block[1], 1);
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encode_block(s, block[3], 3);
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encode_block(s, block[6], 6);
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encode_block(s, block[10], 10);
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encode_block(s, block[7], 7);
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encode_block(s, block[11], 11);
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}
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} else {
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for(i=0;i<5;i++) {
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encode_block(s, block[i], i);
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}
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if (s->chroma_format == CHROMA_420) {
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encode_block(s, block[5], 5);
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} else {
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encode_block(s, block[6], 6);
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encode_block(s, block[5], 5);
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encode_block(s, block[7], 7);
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}
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}
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s->i_tex_bits += get_bits_diff(s);
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}
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// maximum over s->mjpeg_vsample[i]
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#define V_MAX 2
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static int amv_encode_picture(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *pic_arg, int *got_packet)
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{
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MpegEncContext *s = avctx->priv_data;
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AVFrame *pic;
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int i, ret;
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int chroma_h_shift, chroma_v_shift;
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av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift, &chroma_v_shift);
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//CODEC_FLAG_EMU_EDGE have to be cleared
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if(s->avctx->flags & CODEC_FLAG_EMU_EDGE)
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return AVERROR(EINVAL);
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if ((avctx->height & 15) && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
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av_log(avctx, AV_LOG_ERROR,
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"Heights which are not a multiple of 16 might fail with some decoders, "
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"use vstrict=-1 / -strict -1 to use %d anyway.\n", avctx->height);
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av_log(avctx, AV_LOG_WARNING, "If you have a device that plays AMV videos, please test if videos "
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"with such heights work with it and report your findings to ffmpeg-devel@ffmpeg.org\n");
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return AVERROR_EXPERIMENTAL;
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}
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pic = av_frame_clone(pic_arg);
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if (!pic)
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return AVERROR(ENOMEM);
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//picture should be flipped upside-down
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for(i=0; i < 3; i++) {
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int vsample = i ? 2 >> chroma_v_shift : 2;
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pic->data[i] += pic->linesize[i] * (vsample * s->height / V_MAX - 1);
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pic->linesize[i] *= -1;
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}
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ret = ff_mpv_encode_picture(avctx, pkt, pic, got_packet);
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av_frame_free(&pic);
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return ret;
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}
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#if CONFIG_MJPEG_ENCODER
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AVCodec ff_mjpeg_encoder = {
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.name = "mjpeg",
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.long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_MJPEG,
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.priv_data_size = sizeof(MpegEncContext),
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.init = ff_mpv_encode_init,
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.encode2 = ff_mpv_encode_picture,
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.close = ff_mpv_encode_end,
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.capabilities = CODEC_CAP_SLICE_THREADS | CODEC_CAP_FRAME_THREADS | CODEC_CAP_INTRA_ONLY,
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.pix_fmts = (const enum AVPixelFormat[]){
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AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_NONE
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},
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};
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#endif
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#if CONFIG_AMV_ENCODER
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AVCodec ff_amv_encoder = {
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.name = "amv",
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.long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_AMV,
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.priv_data_size = sizeof(MpegEncContext),
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.init = ff_mpv_encode_init,
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.encode2 = amv_encode_picture,
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.close = ff_mpv_encode_end,
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.pix_fmts = (const enum AVPixelFormat[]){
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AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_NONE
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},
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};
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#endif
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