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ffmpeg/libavcodec/mjpegenc.c

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/*
* MJPEG encoder
* Copyright (c) 2000, 2001 Fabrice Bellard
* Copyright (c) 2003 Alex Beregszaszi
* Copyright (c) 2003-2004 Michael Niedermayer
*
* Support for external huffman table, various fixes (AVID workaround),
* aspecting, new decode_frame mechanism and apple mjpeg-b support
* by Alex Beregszaszi
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* MJPEG encoder.
*/
#include "config_components.h"
#include "libavutil/pixdesc.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "jpegtables.h"
#include "mjpegenc_common.h"
#include "mjpegenc_huffman.h"
#include "mpegvideo.h"
#include "mjpeg.h"
#include "mjpegenc.h"
#include "mpegvideoenc.h"
#include "profiles.h"
/* The following is the private context of MJPEG/AMV decoder.
* Note that when using slice threading only the main thread's
* MpegEncContext is followed by a MjpegContext; the other threads
* can access this shared context via MpegEncContext.mjpeg. */
typedef struct MJPEGEncContext {
MpegEncContext mpeg;
MJpegContext mjpeg;
} MJPEGEncContext;
static av_cold void init_uni_ac_vlc(const uint8_t huff_size_ac[256],
uint8_t *uni_ac_vlc_len)
{
for (int i = 0; i < 128; i++) {
int level = i - 64;
if (!level)
continue;
for (int run = 0; run < 64; run++) {
int len, code, nbits;
int alevel = FFABS(level);
len = (run >> 4) * huff_size_ac[0xf0];
nbits= av_log2_16bit(alevel) + 1;
code = ((15&run) << 4) | nbits;
len += huff_size_ac[code] + nbits;
uni_ac_vlc_len[UNI_AC_ENC_INDEX(run, i)] = len;
// We ignore EOB as its just a constant which does not change generally
}
}
}
static void mjpeg_encode_picture_header(MpegEncContext *s)
{
ff_mjpeg_encode_picture_header(s->avctx, &s->pb, s->picture->f, s->mjpeg_ctx,
&s->intra_scantable, 0,
s->intra_matrix, s->chroma_intra_matrix,
s->slice_context_count > 1);
s->esc_pos = put_bytes_count(&s->pb, 0);
for (int i = 1; i < s->slice_context_count; i++)
s->thread_context[i]->esc_pos = 0;
}
void ff_mjpeg_amv_encode_picture_header(MpegEncContext *s)
{
MJPEGEncContext *const m = (MJPEGEncContext*)s;
av_assert2(s->mjpeg_ctx == &m->mjpeg);
/* s->huffman == HUFFMAN_TABLE_OPTIMAL can only be true for MJPEG. */
if (!CONFIG_MJPEG_ENCODER || m->mjpeg.huffman != HUFFMAN_TABLE_OPTIMAL)
mjpeg_encode_picture_header(s);
}
#if CONFIG_MJPEG_ENCODER
/**
* Encodes and outputs the entire frame in the JPEG format.
*
* @param s The MpegEncContext.
*/
static void mjpeg_encode_picture_frame(MpegEncContext *s)
{
int nbits, code, table_id;
MJpegContext *m = s->mjpeg_ctx;
uint8_t *huff_size[4] = { m->huff_size_dc_luminance,
m->huff_size_dc_chrominance,
m->huff_size_ac_luminance,
m->huff_size_ac_chrominance };
uint16_t *huff_code[4] = { m->huff_code_dc_luminance,
m->huff_code_dc_chrominance,
m->huff_code_ac_luminance,
m->huff_code_ac_chrominance };
size_t total_bits = 0;
size_t bytes_needed;
s->header_bits = get_bits_diff(s);
// Estimate the total size first
for (int i = 0; i < m->huff_ncode; i++) {
table_id = m->huff_buffer[i].table_id;
code = m->huff_buffer[i].code;
nbits = code & 0xf;
total_bits += huff_size[table_id][code] + nbits;
}
bytes_needed = (total_bits + 7) / 8;
ff_mpv_reallocate_putbitbuffer(s, bytes_needed, bytes_needed);
for (int i = 0; i < m->huff_ncode; i++) {
table_id = m->huff_buffer[i].table_id;
code = m->huff_buffer[i].code;
nbits = code & 0xf;
put_bits(&s->pb, huff_size[table_id][code], huff_code[table_id][code]);
if (nbits != 0) {
put_sbits(&s->pb, nbits, m->huff_buffer[i].mant);
}
}
m->huff_ncode = 0;
s->i_tex_bits = get_bits_diff(s);
}
/**
* Builds all 4 optimal Huffman tables.
*
* Uses the data stored in the JPEG buffer to compute the tables.
* Stores the Huffman tables in the bits_* and val_* arrays in the MJpegContext.
*
* @param m MJpegContext containing the JPEG buffer.
*/
static void mjpeg_build_optimal_huffman(MJpegContext *m)
{
MJpegEncHuffmanContext dc_luminance_ctx;
MJpegEncHuffmanContext dc_chrominance_ctx;
MJpegEncHuffmanContext ac_luminance_ctx;
MJpegEncHuffmanContext ac_chrominance_ctx;
MJpegEncHuffmanContext *ctx[4] = { &dc_luminance_ctx,
&dc_chrominance_ctx,
&ac_luminance_ctx,
&ac_chrominance_ctx };
for (int i = 0; i < 4; i++)
ff_mjpeg_encode_huffman_init(ctx[i]);
for (int i = 0; i < m->huff_ncode; i++) {
int table_id = m->huff_buffer[i].table_id;
int code = m->huff_buffer[i].code;
ff_mjpeg_encode_huffman_increment(ctx[table_id], code);
}
ff_mjpeg_encode_huffman_close(&dc_luminance_ctx,
m->bits_dc_luminance,
m->val_dc_luminance, 12);
ff_mjpeg_encode_huffman_close(&dc_chrominance_ctx,
m->bits_dc_chrominance,
m->val_dc_chrominance, 12);
ff_mjpeg_encode_huffman_close(&ac_luminance_ctx,
m->bits_ac_luminance,
m->val_ac_luminance, 256);
ff_mjpeg_encode_huffman_close(&ac_chrominance_ctx,
m->bits_ac_chrominance,
m->val_ac_chrominance, 256);
ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance,
m->huff_code_dc_luminance,
m->bits_dc_luminance,
m->val_dc_luminance);
ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
m->huff_code_dc_chrominance,
m->bits_dc_chrominance,
m->val_dc_chrominance);
ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
m->huff_code_ac_luminance,
m->bits_ac_luminance,
m->val_ac_luminance);
ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
m->huff_code_ac_chrominance,
m->bits_ac_chrominance,
m->val_ac_chrominance);
}
#endif
/**
* Writes the complete JPEG frame when optimal huffman tables are enabled,
* otherwise writes the stuffing.
*
* Header + values + stuffing.
*
* @param s The MpegEncContext.
* @return int Error code, 0 if successful.
*/
int ff_mjpeg_encode_stuffing(MpegEncContext *s)
{
MJpegContext *const m = s->mjpeg_ctx;
PutBitContext *pbc = &s->pb;
int mb_y = s->mb_y - !s->mb_x;
int ret;
#if CONFIG_MJPEG_ENCODER
if (m->huffman == HUFFMAN_TABLE_OPTIMAL) {
mjpeg_build_optimal_huffman(m);
// Replace the VLCs with the optimal ones.
// The default ones may be used for trellis during quantization.
init_uni_ac_vlc(m->huff_size_ac_luminance, m->uni_ac_vlc_len);
init_uni_ac_vlc(m->huff_size_ac_chrominance, m->uni_chroma_ac_vlc_len);
s->intra_ac_vlc_length =
s->intra_ac_vlc_last_length = m->uni_ac_vlc_len;
s->intra_chroma_ac_vlc_length =
s->intra_chroma_ac_vlc_last_length = m->uni_chroma_ac_vlc_len;
mjpeg_encode_picture_header(s);
mjpeg_encode_picture_frame(s);
}
#endif
ret = ff_mpv_reallocate_putbitbuffer(s, put_bits_count(&s->pb) / 8 + 100,
put_bits_count(&s->pb) / 4 + 1000);
if (ret < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Buffer reallocation failed\n");
goto fail;
}
ff_mjpeg_escape_FF(pbc, s->esc_pos);
if (s->slice_context_count > 1 && mb_y < s->mb_height - 1)
put_marker(pbc, RST0 + (mb_y&7));
s->esc_pos = put_bytes_count(pbc, 0);
fail:
for (int i = 0; i < 3; i++)
s->last_dc[i] = 128 << s->intra_dc_precision;
return ret;
}
static int alloc_huffman(MpegEncContext *s)
{
MJpegContext *m = s->mjpeg_ctx;
size_t num_mbs, num_blocks, num_codes;
int blocks_per_mb;
// We need to init this here as the mjpeg init is called before the common init,
s->mb_width = (s->width + 15) / 16;
s->mb_height = (s->height + 15) / 16;
switch (s->chroma_format) {
case CHROMA_420: blocks_per_mb = 6; break;
case CHROMA_422: blocks_per_mb = 8; break;
case CHROMA_444: blocks_per_mb = 12; break;
default: av_assert0(0);
};
// Make sure we have enough space to hold this frame.
num_mbs = s->mb_width * s->mb_height;
num_blocks = num_mbs * blocks_per_mb;
num_codes = num_blocks * 64;
m->huff_buffer = av_malloc_array(num_codes, sizeof(MJpegHuffmanCode));
if (!m->huff_buffer)
return AVERROR(ENOMEM);
return 0;
}
av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
{
MJpegContext *const m = &((MJPEGEncContext*)s)->mjpeg;
int ret, use_slices;
s->mjpeg_ctx = m;
use_slices = s->avctx->slices > 0 ? s->avctx->slices > 1 :
(s->avctx->active_thread_type & FF_THREAD_SLICE) &&
s->avctx->thread_count > 1;
if (s->codec_id == AV_CODEC_ID_AMV || use_slices)
m->huffman = HUFFMAN_TABLE_DEFAULT;
if (s->mpv_flags & FF_MPV_FLAG_QP_RD) {
// Used to produce garbage with MJPEG.
av_log(s->avctx, AV_LOG_ERROR,
"QP RD is no longer compatible with MJPEG or AMV\n");
return AVERROR(EINVAL);
}
/* The following check is automatically true for AMV,
* but it doesn't hurt either. */
ret = ff_mjpeg_encode_check_pix_fmt(s->avctx);
if (ret < 0)
return ret;
if (s->width > 65500 || s->height > 65500) {
av_log(s, AV_LOG_ERROR, "JPEG does not support resolutions above 65500x65500\n");
return AVERROR(EINVAL);
}
s->min_qcoeff=-1023;
s->max_qcoeff= 1023;
// Build default Huffman tables.
// These may be overwritten later with more optimal Huffman tables, but
// they are needed at least right now for some processes like trellis.
ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance,
m->huff_code_dc_luminance,
ff_mjpeg_bits_dc_luminance,
ff_mjpeg_val_dc);
ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
m->huff_code_dc_chrominance,
ff_mjpeg_bits_dc_chrominance,
ff_mjpeg_val_dc);
ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
m->huff_code_ac_luminance,
ff_mjpeg_bits_ac_luminance,
ff_mjpeg_val_ac_luminance);
ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
m->huff_code_ac_chrominance,
ff_mjpeg_bits_ac_chrominance,
ff_mjpeg_val_ac_chrominance);
init_uni_ac_vlc(m->huff_size_ac_luminance, m->uni_ac_vlc_len);
init_uni_ac_vlc(m->huff_size_ac_chrominance, m->uni_chroma_ac_vlc_len);
s->intra_ac_vlc_length =
s->intra_ac_vlc_last_length = m->uni_ac_vlc_len;
s->intra_chroma_ac_vlc_length =
s->intra_chroma_ac_vlc_last_length = m->uni_chroma_ac_vlc_len;
// Buffers start out empty.
m->huff_ncode = 0;
if (m->huffman == HUFFMAN_TABLE_OPTIMAL)
return alloc_huffman(s);
return 0;
}
static av_cold int mjpeg_encode_close(AVCodecContext *avctx)
{
MJPEGEncContext *const mjpeg = avctx->priv_data;
av_freep(&mjpeg->mjpeg.huff_buffer);
ff_mpv_encode_end(avctx);
return 0;
}
/**
* Add code and table_id to the JPEG buffer.
*
* @param s The MJpegContext which contains the JPEG buffer.
* @param table_id Which Huffman table the code belongs to.
* @param code The encoded exponent of the coefficients and the run-bits.
*/
static inline void ff_mjpeg_encode_code(MJpegContext *s, uint8_t table_id, int code)
{
MJpegHuffmanCode *c = &s->huff_buffer[s->huff_ncode++];
c->table_id = table_id;
c->code = code;
}
/**
* Add the coefficient's data to the JPEG buffer.
*
* @param s The MJpegContext which contains the JPEG buffer.
* @param table_id Which Huffman table the code belongs to.
* @param val The coefficient.
* @param run The run-bits.
*/
static void ff_mjpeg_encode_coef(MJpegContext *s, uint8_t table_id, int val, int run)
{
int mant, code;
if (val == 0) {
av_assert0(run == 0);
ff_mjpeg_encode_code(s, table_id, 0);
} else {
mant = val;
if (val < 0) {
val = -val;
mant--;
}
code = (run << 4) | (av_log2_16bit(val) + 1);
s->huff_buffer[s->huff_ncode].mant = mant;
ff_mjpeg_encode_code(s, table_id, code);
}
}
/**
* Add the block's data into the JPEG buffer.
*
* @param s The MpegEncContext that contains the JPEG buffer.
* @param block The block.
* @param n The block's index or number.
*/
static void record_block(MpegEncContext *s, int16_t *block, int n)
{
int i, j, table_id;
int component, dc, last_index, val, run;
MJpegContext *m = s->mjpeg_ctx;
/* DC coef */
component = (n <= 3 ? 0 : (n&1) + 1);
table_id = (n <= 3 ? 0 : 1);
dc = block[0]; /* overflow is impossible */
val = dc - s->last_dc[component];
ff_mjpeg_encode_coef(m, table_id, val, 0);
s->last_dc[component] = dc;
/* AC coefs */
run = 0;
last_index = s->block_last_index[n];
table_id |= 2;
for(i=1;i<=last_index;i++) {
j = s->intra_scantable.permutated[i];
val = block[j];
if (val == 0) {
run++;
} else {
while (run >= 16) {
ff_mjpeg_encode_code(m, table_id, 0xf0);
run -= 16;
}
ff_mjpeg_encode_coef(m, table_id, val, run);
run = 0;
}
}
/* output EOB only if not already 64 values */
if (last_index < 63 || run != 0)
ff_mjpeg_encode_code(m, table_id, 0);
}
static void encode_block(MpegEncContext *s, int16_t *block, int n)
{
int mant, nbits, code, i, j;
int component, dc, run, last_index, val;
MJpegContext *m = s->mjpeg_ctx;
uint8_t *huff_size_ac;
uint16_t *huff_code_ac;
/* DC coef */
component = (n <= 3 ? 0 : (n&1) + 1);
dc = block[0]; /* overflow is impossible */
val = dc - s->last_dc[component];
if (n < 4) {
ff_mjpeg_encode_dc(&s->pb, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
huff_size_ac = m->huff_size_ac_luminance;
huff_code_ac = m->huff_code_ac_luminance;
} else {
ff_mjpeg_encode_dc(&s->pb, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
huff_size_ac = m->huff_size_ac_chrominance;
huff_code_ac = m->huff_code_ac_chrominance;
}
s->last_dc[component] = dc;
/* AC coefs */
run = 0;
last_index = s->block_last_index[n];
for(i=1;i<=last_index;i++) {
j = s->intra_scantable.permutated[i];
val = block[j];
if (val == 0) {
run++;
} else {
while (run >= 16) {
put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
run -= 16;
}
mant = val;
if (val < 0) {
val = -val;
mant--;
}
nbits= av_log2_16bit(val) + 1;
code = (run << 4) | nbits;
put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
put_sbits(&s->pb, nbits, mant);
run = 0;
}
}
/* output EOB only if not already 64 values */
if (last_index < 63 || run != 0)
put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
}
void ff_mjpeg_encode_mb(MpegEncContext *s, int16_t block[12][64])
{
int i;
if (s->mjpeg_ctx->huffman == HUFFMAN_TABLE_OPTIMAL) {
if (s->chroma_format == CHROMA_444) {
record_block(s, block[0], 0);
record_block(s, block[2], 2);
record_block(s, block[4], 4);
record_block(s, block[8], 8);
record_block(s, block[5], 5);
record_block(s, block[9], 9);
if (16*s->mb_x+8 < s->width) {
record_block(s, block[1], 1);
record_block(s, block[3], 3);
record_block(s, block[6], 6);
record_block(s, block[10], 10);
record_block(s, block[7], 7);
record_block(s, block[11], 11);
}
} else {
for(i=0;i<5;i++) {
record_block(s, block[i], i);
}
if (s->chroma_format == CHROMA_420) {
record_block(s, block[5], 5);
} else {
record_block(s, block[6], 6);
record_block(s, block[5], 5);
record_block(s, block[7], 7);
}
}
} else {
if (s->chroma_format == CHROMA_444) {
encode_block(s, block[0], 0);
encode_block(s, block[2], 2);
encode_block(s, block[4], 4);
encode_block(s, block[8], 8);
encode_block(s, block[5], 5);
encode_block(s, block[9], 9);
if (16*s->mb_x+8 < s->width) {
encode_block(s, block[1], 1);
encode_block(s, block[3], 3);
encode_block(s, block[6], 6);
encode_block(s, block[10], 10);
encode_block(s, block[7], 7);
encode_block(s, block[11], 11);
}
} else {
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);
}
}
s->i_tex_bits += get_bits_diff(s);
}
}
#if CONFIG_AMV_ENCODER
// maximum over s->mjpeg_vsample[i]
#define V_MAX 2
static int amv_encode_picture(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *pic_arg, int *got_packet)
{
MpegEncContext *s = avctx->priv_data;
AVFrame *pic;
int i, ret;
int chroma_h_shift, chroma_v_shift;
av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift, &chroma_v_shift);
if ((avctx->height & 15) && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
av_log(avctx, AV_LOG_ERROR,
"Heights which are not a multiple of 16 might fail with some decoders, "
"use vstrict=-1 / -strict -1 to use %d anyway.\n", avctx->height);
av_log(avctx, AV_LOG_WARNING, "If you have a device that plays AMV videos, please test if videos "
"with such heights work with it and report your findings to ffmpeg-devel@ffmpeg.org\n");
return AVERROR_EXPERIMENTAL;
}
pic = av_frame_clone(pic_arg);
if (!pic)
return AVERROR(ENOMEM);
//picture should be flipped upside-down
for(i=0; i < 3; i++) {
int vsample = i ? 2 >> chroma_v_shift : 2;
pic->data[i] += pic->linesize[i] * (vsample * s->height / V_MAX - 1);
pic->linesize[i] *= -1;
}
ret = ff_mpv_encode_picture(avctx, pkt, pic, got_packet);
av_frame_free(&pic);
return ret;
}
#endif
#define OFFSET(x) offsetof(MJPEGEncContext, mjpeg.x)
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
FF_MPV_COMMON_OPTS
{ "huffman", "Huffman table strategy", OFFSET(huffman), AV_OPT_TYPE_INT, { .i64 = HUFFMAN_TABLE_OPTIMAL }, 0, NB_HUFFMAN_TABLE_OPTION - 1, VE, "huffman" },
{ "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = HUFFMAN_TABLE_DEFAULT }, INT_MIN, INT_MAX, VE, "huffman" },
{ "optimal", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = HUFFMAN_TABLE_OPTIMAL }, INT_MIN, INT_MAX, VE, "huffman" },
{ "force_duplicated_matrix", "Always write luma and chroma matrix for mjpeg, useful for rtp streaming.", OFFSET(force_duplicated_matrix), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, VE },
{ NULL},
};
#if CONFIG_MJPEG_ENCODER
static const AVClass mjpeg_class = {
.class_name = "mjpeg encoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFCodec ff_mjpeg_encoder = {
.p.name = "mjpeg",
.p.long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_MJPEG,
.priv_data_size = sizeof(MJPEGEncContext),
.init = ff_mpv_encode_init,
FF_CODEC_ENCODE_CB(ff_mpv_encode_picture),
.close = mjpeg_encode_close,
.p.capabilities = AV_CODEC_CAP_SLICE_THREADS | AV_CODEC_CAP_FRAME_THREADS,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
.p.pix_fmts = (const enum AVPixelFormat[]) {
AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P,
AV_PIX_FMT_NONE
},
.p.priv_class = &mjpeg_class,
.p.profiles = NULL_IF_CONFIG_SMALL(ff_mjpeg_profiles),
};
#endif
#if CONFIG_AMV_ENCODER
static const AVClass amv_class = {
.class_name = "amv encoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFCodec ff_amv_encoder = {
.p.name = "amv",
.p.long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_AMV,
.priv_data_size = sizeof(MJPEGEncContext),
.init = ff_mpv_encode_init,
FF_CODEC_ENCODE_CB(amv_encode_picture),
.close = mjpeg_encode_close,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
.p.pix_fmts = (const enum AVPixelFormat[]) {
AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_NONE
},
.p.priv_class = &amv_class,
};
#endif
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