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FFmpeg/libavformat/avienc.c
Andreas Rheinhardt 5eafbf0b08 avformat/avienc: Simplify writing padding 
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-09-27 07:08:59 +02:00

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/*
* AVI muxer
* Copyright (c) 2000 Fabrice Bellard
*
* 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
*/
#include <math.h>
#include "avformat.h"
#include "internal.h"
#include "avi.h"
#include "avio_internal.h"
#include "riff.h"
#include "mpegts.h"
#include "libavformat/avlanguage.h"
#include "libavutil/avstring.h"
#include "libavutil/avutil.h"
#include "libavutil/internal.h"
#include "libavutil/dict.h"
#include "libavutil/avassert.h"
#include "libavutil/timestamp.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavcodec/raw.h"
/*
* TODO:
* - fill all fields if non streamed (nb_frames for example)
*/
typedef struct AVIIentry {
char tag[4];
unsigned int flags;
unsigned int pos;
unsigned int len;
} AVIIentry;
#define AVI_INDEX_CLUSTER_SIZE 16384
#define AVI_MASTER_INDEX_PREFIX_SIZE (8+2+1+1+4+8+4+4)
#define AVI_MASTER_INDEX_ENTRY_SIZE 16 /* bytes per entry */
#define AVI_MASTER_INDEX_SIZE_DEFAULT 256 /* number of entries */
typedef struct AVIIndex {
int64_t indx_start;
int64_t audio_strm_offset;
int entry;
int ents_allocated;
int master_odml_riff_id_base;
AVIIentry** cluster;
} AVIIndex;
typedef struct AVIContext {
const AVClass *class;
AVPacket *empty_packet;
int64_t riff_start, movi_list, odml_list;
int64_t frames_hdr_all;
int riff_id;
int reserve_index_space;
int master_index_max_size;
int write_channel_mask;
int flipped_raw_rgb;
} AVIContext;
typedef struct AVIStream {
int64_t frames_hdr_strm;
int64_t audio_strm_length;
int packet_count;
int entry;
int max_size;
int sample_requested;
int64_t last_dts;
AVIIndex indexes;
int64_t strh_flags_offset;
uint32_t palette[AVPALETTE_COUNT];
uint32_t old_palette[AVPALETTE_COUNT];
int64_t pal_offset;
} AVIStream;
static int avi_write_packet_internal(AVFormatContext *s, AVPacket *pkt);
static inline AVIIentry *avi_get_ientry(const AVIIndex *idx, int ent_id)
{
int cl = ent_id / AVI_INDEX_CLUSTER_SIZE;
int id = ent_id % AVI_INDEX_CLUSTER_SIZE;
return &idx->cluster[cl][id];
}
static int avi_add_ientry(AVFormatContext *s, int stream_index, char *tag,
unsigned int flags, unsigned int size)
{
AVIContext *avi = s->priv_data;
AVIOContext *pb = s->pb;
AVIStream *avist = s->streams[stream_index]->priv_data;
AVIIndex *idx = &avist->indexes;
int cl = idx->entry / AVI_INDEX_CLUSTER_SIZE;
int id = idx->entry % AVI_INDEX_CLUSTER_SIZE;
if (idx->ents_allocated <= idx->entry) {
idx->cluster = av_realloc_f(idx->cluster, sizeof(void*), cl+1);
if (!idx->cluster) {
idx->ents_allocated = 0;
idx->entry = 0;
return AVERROR(ENOMEM);
}
idx->cluster[cl] =
av_malloc(AVI_INDEX_CLUSTER_SIZE * sizeof(AVIIentry));
if (!idx->cluster[cl])
return AVERROR(ENOMEM);
idx->ents_allocated += AVI_INDEX_CLUSTER_SIZE;
}
if (tag)
memcpy(idx->cluster[cl][id].tag, tag, 4);
else
memset(idx->cluster[cl][id].tag, 0, 4);
idx->cluster[cl][id].flags = flags;
idx->cluster[cl][id].pos = avio_tell(pb) - avi->movi_list;
idx->cluster[cl][id].len = size;
avist->max_size = FFMAX(avist->max_size, size);
idx->entry++;
return 0;
}
static av_cold int avi_init(struct AVFormatContext *s)
{
AVIContext *avi = s->priv_data;
if (avi->reserve_index_space > 0) {
avi->master_index_max_size = (avi->reserve_index_space - AVI_MASTER_INDEX_PREFIX_SIZE) / AVI_MASTER_INDEX_ENTRY_SIZE;
avi->master_index_max_size = FFMAX(avi->master_index_max_size, 16);
} else
avi->master_index_max_size = AVI_MASTER_INDEX_SIZE_DEFAULT;
av_log(s, AV_LOG_DEBUG, "reserve_index_space:%d master_index_max_size:%d\n",
avi->reserve_index_space, avi->master_index_max_size);
return 1; /* stream initialization continues in avi_write_header */
}
static int64_t avi_start_new_riff(AVFormatContext *s, AVIOContext *pb,
const char *riff_tag, const char *list_tag)
{
AVIContext *avi = s->priv_data;
int64_t loff;
int i;
avi->riff_id++;
for (i = 0; i < s->nb_streams; i++) {
AVIStream *avist = s->streams[i]->priv_data;
avist->indexes.audio_strm_offset = avist->audio_strm_length;
avist->indexes.entry = 0;
}
avi->riff_start = ff_start_tag(pb, "RIFF");
ffio_wfourcc(pb, riff_tag);
loff = ff_start_tag(pb, "LIST");
ffio_wfourcc(pb, list_tag);
return loff;
}
static char *avi_stream2fourcc(char *tag, int index, enum AVMediaType type)
{
tag[0] = '0' + index / 10;
tag[1] = '0' + index % 10;
if (type == AVMEDIA_TYPE_VIDEO) {
tag[2] = 'd';
tag[3] = 'c';
} else if (type == AVMEDIA_TYPE_SUBTITLE) {
// note: this is not an official code
tag[2] = 's';
tag[3] = 'b';
} else {
tag[2] = 'w';
tag[3] = 'b';
}
tag[4] = '\0';
return tag;
}
static int avi_write_counters(AVFormatContext *s, int riff_id)
{
AVIOContext *pb = s->pb;
AVIContext *avi = s->priv_data;
int n, au_byterate, au_ssize, au_scale, nb_frames = 0;
int64_t file_size;
AVCodecParameters *par;
file_size = avio_tell(pb);
for (n = 0; n < s->nb_streams; n++) {
AVIStream *avist = s->streams[n]->priv_data;
av_assert0(avist->frames_hdr_strm);
par = s->streams[n]->codecpar;
avio_seek(pb, avist->frames_hdr_strm, SEEK_SET);
ff_parse_specific_params(s->streams[n], &au_byterate, &au_ssize, &au_scale);
if (au_ssize == 0)
avio_wl32(pb, avist->packet_count);
else
avio_wl32(pb, avist->audio_strm_length / au_ssize);
if (par->codec_type == AVMEDIA_TYPE_VIDEO)
nb_frames = FFMAX(nb_frames, avist->packet_count);
}
if (riff_id == 1) {
av_assert0(avi->frames_hdr_all);
avio_seek(pb, avi->frames_hdr_all, SEEK_SET);
avio_wl32(pb, nb_frames);
}
avio_seek(pb, file_size, SEEK_SET);
return 0;
}
static void write_odml_master(AVFormatContext *s, int stream_index)
{
AVIOContext *pb = s->pb;
AVIContext *avi = s->priv_data;
AVStream *st = s->streams[stream_index];
AVCodecParameters *par = st->codecpar;
AVIStream *avist = st->priv_data;
unsigned char tag[5];
/* Starting to lay out AVI OpenDML master index.
* We want to make it JUNK entry for now, since we'd
* like to get away without making AVI an OpenDML one
* for compatibility reasons. */
avist->indexes.indx_start = ff_start_tag(pb, "JUNK");
avio_wl16(pb, 4); /* wLongsPerEntry */
avio_w8(pb, 0); /* bIndexSubType (0 == frame index) */
avio_w8(pb, 0); /* bIndexType (0 == AVI_INDEX_OF_INDEXES) */
avio_wl32(pb, 0); /* nEntriesInUse (will fill out later on) */
ffio_wfourcc(pb, avi_stream2fourcc(tag, stream_index, par->codec_type));
/* dwChunkId */
ffio_fill(pb, 0, 3 * 4 /* dwReserved[3] */
+ 16LL * avi->master_index_max_size);
ff_end_tag(pb, avist->indexes.indx_start);
}
static int avi_write_header(AVFormatContext *s)
{
AVIContext *avi = s->priv_data;
AVIOContext *pb = s->pb;
int bitrate, n, i, nb_frames, au_byterate, au_ssize, au_scale;
int64_t max_stream_duration = 0;
AVCodecParameters *video_par;
AVStream *video_st = NULL;
int64_t list1, list2, strh, strf;
AVDictionaryEntry *t = NULL;
int padding;
if (s->nb_streams > AVI_MAX_STREAM_COUNT) {
av_log(s, AV_LOG_ERROR, "AVI does not support "
">"AV_STRINGIFY(AVI_MAX_STREAM_COUNT)" streams\n");
return AVERROR(EINVAL);
}
avi->empty_packet = av_packet_alloc();
if (!avi->empty_packet)
return AVERROR(ENOMEM);
for (n = 0; n < s->nb_streams; n++) {
s->streams[n]->priv_data = av_mallocz(sizeof(AVIStream));
if (!s->streams[n]->priv_data)
return AVERROR(ENOMEM);
}
/* header list */
avi->riff_id = 0;
list1 = avi_start_new_riff(s, pb, "AVI ", "hdrl");
/* avi header */
ffio_wfourcc(pb, "avih");
avio_wl32(pb, 14 * 4);
bitrate = 0;
video_par = NULL;
for (n = 0; n < s->nb_streams; n++) {
AVCodecParameters *par = s->streams[n]->codecpar;
AVStream *st = s->streams[n];
bitrate = FFMIN(bitrate + par->bit_rate, INT32_MAX);
if (st->duration > 0) {
int64_t stream_duration = av_rescale_q(st->duration, st->time_base, AV_TIME_BASE_Q);
max_stream_duration = FFMAX(stream_duration, max_stream_duration);
}
if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
video_par = par;
video_st = st;
}
}
/* guess master index size based on bitrate and duration */
if (!avi->reserve_index_space) {
double duration_est, filesize_est;
if (s->duration > 0)
duration_est = (double)s->duration / AV_TIME_BASE;
else if (max_stream_duration > 0)
duration_est = (double)max_stream_duration / AV_TIME_BASE;
else
duration_est = 10 * 60 * 60; /* default to 10 hours */
filesize_est = duration_est * (bitrate / 8) * 1.10; /* add 10% safety margin for muxer+bitrate */
avi->master_index_max_size = FFMAX((int)ceil(filesize_est / AVI_MAX_RIFF_SIZE) + 1,
avi->master_index_max_size);
av_log(s, AV_LOG_DEBUG, "duration_est:%0.3f, filesize_est:%0.1fGiB, master_index_max_size:%d\n",
duration_est, filesize_est / (1024*1024*1024), avi->master_index_max_size);
}
nb_frames = 0;
// TODO: should be avg_frame_rate
if (video_st)
avio_wl32(pb, (uint32_t) (INT64_C(1000000) * video_st->time_base.num /
video_st->time_base.den));
else
avio_wl32(pb, 0);
avio_wl32(pb, bitrate / 8); /* XXX: not quite exact */
avio_wl32(pb, 0); /* padding */
if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
avio_wl32(pb, AVIF_TRUSTCKTYPE | AVIF_ISINTERLEAVED); /* flags */
else
avio_wl32(pb, AVIF_TRUSTCKTYPE | AVIF_HASINDEX | AVIF_ISINTERLEAVED); /* flags */
avi->frames_hdr_all = avio_tell(pb); /* remember this offset to fill later */
avio_wl32(pb, nb_frames); /* nb frames, filled later */
avio_wl32(pb, 0); /* initial frame */
avio_wl32(pb, s->nb_streams); /* nb streams */
avio_wl32(pb, 1024 * 1024); /* suggested buffer size */
if (video_par) {
avio_wl32(pb, video_par->width);
avio_wl32(pb, video_par->height);
} else {
avio_wl32(pb, 0);
avio_wl32(pb, 0);
}
ffio_fill(pb, 0, 4 * 4); /* reserved */
/* stream list */
for (i = 0; i < n; i++) {
AVStream *st = s->streams[i];
AVCodecParameters *par = st->codecpar;
AVIStream *avist = st->priv_data;
list2 = ff_start_tag(pb, "LIST");
ffio_wfourcc(pb, "strl");
/* stream generic header */
strh = ff_start_tag(pb, "strh");
switch (par->codec_type) {
case AVMEDIA_TYPE_SUBTITLE:
// XSUB subtitles behave like video tracks, other subtitles
// are not (yet) supported.
if (par->codec_id != AV_CODEC_ID_XSUB) {
avpriv_report_missing_feature(s, "Subtitle streams other than DivX XSUB");
return AVERROR_PATCHWELCOME;
}
case AVMEDIA_TYPE_VIDEO:
ffio_wfourcc(pb, "vids");
break;
case AVMEDIA_TYPE_AUDIO:
ffio_wfourcc(pb, "auds");
break;
// case AVMEDIA_TYPE_TEXT:
// ffio_wfourcc(pb, "txts");
// break;
case AVMEDIA_TYPE_DATA:
ffio_wfourcc(pb, "dats");
break;
}
if (par->codec_type == AVMEDIA_TYPE_VIDEO ||
par->codec_id == AV_CODEC_ID_XSUB)
avio_wl32(pb, par->codec_tag);
else
avio_wl32(pb, 1);
avist->strh_flags_offset = avio_tell(pb);
avio_wl32(pb, 0); /* flags */
avio_wl16(pb, 0); /* priority */
avio_wl16(pb, 0); /* language */
avio_wl32(pb, 0); /* initial frame */
ff_parse_specific_params(st, &au_byterate, &au_ssize, &au_scale);
if ( par->codec_type == AVMEDIA_TYPE_VIDEO
&& par->codec_id != AV_CODEC_ID_XSUB
&& au_byterate > 1000LL*au_scale) {
au_byterate = 600;
au_scale = 1;
}
avpriv_set_pts_info(st, 64, au_scale, au_byterate);
if (par->codec_id == AV_CODEC_ID_XSUB)
au_scale = au_byterate = 0;
avio_wl32(pb, au_scale); /* scale */
avio_wl32(pb, au_byterate); /* rate */
avio_wl32(pb, 0); /* start */
/* remember this offset to fill later */
avist->frames_hdr_strm = avio_tell(pb);
if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
/* FIXME: this may be broken, but who cares */
avio_wl32(pb, AVI_MAX_RIFF_SIZE);
else
avio_wl32(pb, 0); /* length, XXX: filled later */
/* suggested buffer size, is set to largest chunk size in avi_write_trailer */
if (par->codec_type == AVMEDIA_TYPE_VIDEO)
avio_wl32(pb, 1024 * 1024);
else if (par->codec_type == AVMEDIA_TYPE_AUDIO)
avio_wl32(pb, 12 * 1024);
else
avio_wl32(pb, 0);
avio_wl32(pb, -1); /* quality */
avio_wl32(pb, au_ssize); /* sample size */
avio_wl32(pb, 0);
avio_wl16(pb, par->width);
avio_wl16(pb, par->height);
ff_end_tag(pb, strh);
if (par->codec_type != AVMEDIA_TYPE_DATA) {
int ret, flags;
enum AVPixelFormat pix_fmt;
strf = ff_start_tag(pb, "strf");
switch (par->codec_type) {
case AVMEDIA_TYPE_SUBTITLE:
/* XSUB subtitles behave like video tracks, other subtitles
* are not (yet) supported. */
if (par->codec_id != AV_CODEC_ID_XSUB)
break;
case AVMEDIA_TYPE_VIDEO:
/* WMP expects RGB 5:5:5 rawvideo in avi to have bpp set to 16. */
if ( !par->codec_tag
&& par->codec_id == AV_CODEC_ID_RAWVIDEO
&& par->format == AV_PIX_FMT_RGB555LE
&& par->bits_per_coded_sample == 15)
par->bits_per_coded_sample = 16;
avist->pal_offset = avio_tell(pb) + 40;
ff_put_bmp_header(pb, par, 0, 0, avi->flipped_raw_rgb);
pix_fmt = avpriv_find_pix_fmt(avpriv_pix_fmt_bps_avi,
par->bits_per_coded_sample);
if ( !par->codec_tag
&& par->codec_id == AV_CODEC_ID_RAWVIDEO
&& par->format != pix_fmt
&& par->format != AV_PIX_FMT_NONE)
av_log(s, AV_LOG_ERROR, "%s rawvideo cannot be written to avi, output file will be unreadable\n",
av_get_pix_fmt_name(par->format));
if (par->format == AV_PIX_FMT_PAL8) {
if (par->bits_per_coded_sample < 0 || par->bits_per_coded_sample > 8) {
av_log(s, AV_LOG_ERROR, "PAL8 with %d bps is not allowed\n", par->bits_per_coded_sample);
return AVERROR(EINVAL);
}
}
break;
case AVMEDIA_TYPE_AUDIO:
flags = (avi->write_channel_mask == 0) ? FF_PUT_WAV_HEADER_SKIP_CHANNELMASK : 0;
if ((ret = ff_put_wav_header(s, pb, par, flags)) < 0)
return ret;
break;
default:
av_log(s, AV_LOG_ERROR,
"Invalid or not supported codec type '%s' found in the input\n",
(char *)av_x_if_null(av_get_media_type_string(par->codec_type), "?"));
return AVERROR(EINVAL);
}
ff_end_tag(pb, strf);
if ((t = av_dict_get(st->metadata, "title", NULL, 0))) {
ff_riff_write_info_tag(s->pb, "strn", t->value);
t = NULL;
}
if (par->codec_id == AV_CODEC_ID_XSUB
&& (t = av_dict_get(s->streams[i]->metadata, "language", NULL, 0))) {
const char* langstr = ff_convert_lang_to(t->value, AV_LANG_ISO639_1);
t = NULL;
if (langstr) {
char* str = av_asprintf("Subtitle - %s-xx;02", langstr);
if (!str)
return AVERROR(ENOMEM);
ff_riff_write_info_tag(s->pb, "strn", str);
av_free(str);
}
}
}
if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
write_odml_master(s, i);
}
if (par->codec_type == AVMEDIA_TYPE_VIDEO &&
st->sample_aspect_ratio.num > 0 &&
st->sample_aspect_ratio.den > 0) {
int vprp = ff_start_tag(pb, "vprp");
AVRational dar = av_mul_q(st->sample_aspect_ratio,
(AVRational) { par->width,
par->height });
int num, den, fields, i;
av_reduce(&num, &den, dar.num, dar.den, 0xFFFF);
if (par->field_order == AV_FIELD_TT || par->field_order == AV_FIELD_BB ||
par->field_order == AV_FIELD_TB || par->field_order == AV_FIELD_BT) {
fields = 2; // interlaced
} else {
fields = 1; // progressive
}
avio_wl32(pb, 0); // video format = unknown
avio_wl32(pb, 0); // video standard = unknown
// TODO: should be avg_frame_rate
avio_wl32(pb, (2LL*st->time_base.den + st->time_base.num - 1) / (2LL * st->time_base.num));
avio_wl32(pb, par->width);
avio_wl32(pb, par->height);
avio_wl16(pb, den);
avio_wl16(pb, num);
avio_wl32(pb, par->width);
avio_wl32(pb, par->height);
avio_wl32(pb, fields); // fields per frame
for (i = 0; i < fields; i++) {
int start_line;
// OpenDML v1.02 is not very specific on what value to use for
// start_line when frame data is not coming from a capturing device,
// so just use 0/1 depending on the field order for interlaced frames
if (par->field_order == AV_FIELD_TT || par->field_order == AV_FIELD_TB) {
start_line = (i == 0) ? 0 : 1;
} else if (par->field_order == AV_FIELD_BB || par->field_order == AV_FIELD_BT) {
start_line = (i == 0) ? 1 : 0;
} else {
start_line = 0;
}
avio_wl32(pb, par->height / fields); // compressed bitmap height
avio_wl32(pb, par->width); // compressed bitmap width
avio_wl32(pb, par->height / fields); // valid bitmap height
avio_wl32(pb, par->width); // valid bitmap width
avio_wl32(pb, 0); // valid bitmap X offset
avio_wl32(pb, 0); // valid bitmap Y offset
avio_wl32(pb, 0); // valid X offset in T
avio_wl32(pb, start_line); // valid Y start line
}
ff_end_tag(pb, vprp);
}
ff_end_tag(pb, list2);
}
if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
/* AVI could become an OpenDML one, if it grows beyond 2Gb range */
avi->odml_list = ff_start_tag(pb, "JUNK");
ffio_wfourcc(pb, "odml");
ffio_wfourcc(pb, "dmlh");
avio_wl32(pb, 248);
ffio_fill(pb, 0, 248);
ff_end_tag(pb, avi->odml_list);
}
ff_end_tag(pb, list1);
ff_riff_write_info(s);
padding = s->metadata_header_padding;
if (padding < 0)
padding = 1016;
/* some padding for easier tag editing */
if (padding) {
list2 = ff_start_tag(pb, "JUNK");
ffio_fill(pb, 0, FFALIGN((uint32_t)padding, 4));
ff_end_tag(pb, list2);
}
avi->movi_list = ff_start_tag(pb, "LIST");
ffio_wfourcc(pb, "movi");
return 0;
}
static void update_odml_entry(AVFormatContext *s, int stream_index, int64_t ix, int size)
{
AVIOContext *pb = s->pb;
AVIContext *avi = s->priv_data;
AVIStream *avist = s->streams[stream_index]->priv_data;
int64_t pos;
int au_byterate, au_ssize, au_scale;
pos = avio_tell(pb);
/* Updating one entry in the AVI OpenDML master index */
avio_seek(pb, avist->indexes.indx_start - 8, SEEK_SET);
ffio_wfourcc(pb, "indx"); /* enabling this entry */
avio_skip(pb, 8);
avio_wl32(pb, avi->riff_id - avist->indexes.master_odml_riff_id_base); /* nEntriesInUse */
avio_skip(pb, 16 * (avi->riff_id - avist->indexes.master_odml_riff_id_base));
avio_wl64(pb, ix); /* qwOffset */
avio_wl32(pb, size); /* dwSize */
ff_parse_specific_params(s->streams[stream_index], &au_byterate, &au_ssize, &au_scale);
if (s->streams[stream_index]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && au_ssize > 0) {
uint32_t audio_segm_size = (avist->audio_strm_length - avist->indexes.audio_strm_offset);
if ((audio_segm_size % au_ssize > 0) && !avist->sample_requested) {
avpriv_request_sample(s, "OpenDML index duration for audio packets with partial frames");
avist->sample_requested = 1;
}
avio_wl32(pb, audio_segm_size / au_ssize); /* dwDuration (sample count) */
} else
avio_wl32(pb, avist->indexes.entry); /* dwDuration (packet count) */
avio_seek(pb, pos, SEEK_SET);
}
static int avi_write_ix(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
AVIContext *avi = s->priv_data;
char tag[5];
char ix_tag[] = "ix00";
int i, j;
av_assert0(pb->seekable & AVIO_SEEKABLE_NORMAL);
for (i = 0; i < s->nb_streams; i++) {
AVIStream *avist = s->streams[i]->priv_data;
if (avi->riff_id - avist->indexes.master_odml_riff_id_base == avi->master_index_max_size) {
int64_t pos;
int size = AVI_MASTER_INDEX_PREFIX_SIZE + AVI_MASTER_INDEX_ENTRY_SIZE * avi->master_index_max_size;
pos = avio_tell(pb);
update_odml_entry(s, i, pos, size);
write_odml_master(s, i);
av_assert1(avio_tell(pb) - pos == size);
avist->indexes.master_odml_riff_id_base = avi->riff_id - 1;
}
av_assert0(avi->riff_id - avist->indexes.master_odml_riff_id_base < avi->master_index_max_size);
}
for (i = 0; i < s->nb_streams; i++) {
AVIStream *avist = s->streams[i]->priv_data;
int64_t ix;
avi_stream2fourcc(tag, i, s->streams[i]->codecpar->codec_type);
ix_tag[3] = '0' + i;
/* Writing AVI OpenDML leaf index chunk */
ix = avio_tell(pb);
ffio_wfourcc(pb, ix_tag); /* ix?? */
avio_wl32(pb, avist->indexes.entry * 8 + 24);
/* chunk size */
avio_wl16(pb, 2); /* wLongsPerEntry */
avio_w8(pb, 0); /* bIndexSubType (0 == frame index) */
avio_w8(pb, 1); /* bIndexType (1 == AVI_INDEX_OF_CHUNKS) */
avio_wl32(pb, avist->indexes.entry);
/* nEntriesInUse */
ffio_wfourcc(pb, tag); /* dwChunkId */
avio_wl64(pb, avi->movi_list); /* qwBaseOffset */
avio_wl32(pb, 0); /* dwReserved_3 (must be 0) */
for (j = 0; j < avist->indexes.entry; j++) {
AVIIentry *ie = avi_get_ientry(&avist->indexes, j);
avio_wl32(pb, ie->pos + 8);
avio_wl32(pb, ((uint32_t) ie->len & ~0x80000000) |
(ie->flags & 0x10 ? 0 : 0x80000000));
}
update_odml_entry(s, i, ix, avio_tell(pb) - ix);
}
return 0;
}
static int avi_write_idx1(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
AVIContext *avi = s->priv_data;
int64_t idx_chunk;
int i;
char tag[5];
if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
AVIStream *avist;
AVIIentry *ie = 0, *tie;
int empty, stream_id = -1;
idx_chunk = ff_start_tag(pb, "idx1");
for (i = 0; i < s->nb_streams; i++) {
avist = s->streams[i]->priv_data;
avist->entry = 0;
}
do {
empty = 1;
for (i = 0; i < s->nb_streams; i++) {
avist = s->streams[i]->priv_data;
if (avist->indexes.entry <= avist->entry)
continue;
tie = avi_get_ientry(&avist->indexes, avist->entry);
if (empty || tie->pos < ie->pos) {
ie = tie;
stream_id = i;
}
empty = 0;
}
if (!empty) {
avist = s->streams[stream_id]->priv_data;
if (*ie->tag)
ffio_wfourcc(pb, ie->tag);
else {
avi_stream2fourcc(tag, stream_id,
s->streams[stream_id]->codecpar->codec_type);
ffio_wfourcc(pb, tag);
}
avio_wl32(pb, ie->flags);
avio_wl32(pb, ie->pos);
avio_wl32(pb, ie->len);
avist->entry++;
}
} while (!empty);
ff_end_tag(pb, idx_chunk);
avi_write_counters(s, avi->riff_id);
}
return 0;
}
static int write_skip_frames(AVFormatContext *s, int stream_index, int64_t dts)
{
AVIContext *avi = s->priv_data;
AVIStream *avist = s->streams[stream_index]->priv_data;
AVCodecParameters *par = s->streams[stream_index]->codecpar;
ff_dlog(s, "dts:%s packet_count:%d stream_index:%d\n", av_ts2str(dts), avist->packet_count, stream_index);
while (par->block_align == 0 && dts != AV_NOPTS_VALUE &&
dts > avist->packet_count && par->codec_id != AV_CODEC_ID_XSUB && avist->packet_count) {
if (dts - avist->packet_count > 60000) {
av_log(s, AV_LOG_ERROR, "Too large number of skipped frames %"PRId64" > 60000\n", dts - avist->packet_count);
return AVERROR(EINVAL);
}
avi->empty_packet->stream_index = stream_index;
avi_write_packet_internal(s, avi->empty_packet);
ff_dlog(s, "dup dts:%s packet_count:%d\n", av_ts2str(dts), avist->packet_count);
}
return 0;
}
static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
{
const int stream_index = pkt->stream_index;
AVCodecParameters *par = s->streams[stream_index]->codecpar;
int ret;
if (par->codec_id == AV_CODEC_ID_H264 && par->codec_tag == MKTAG('H','2','6','4') && pkt->size) {
ret = ff_check_h264_startcode(s, s->streams[stream_index], pkt);
if (ret < 0)
return ret;
}
if ((ret = write_skip_frames(s, stream_index, pkt->dts)) < 0)
return ret;
if (!pkt->size)
return avi_write_packet_internal(s, pkt); /* Passthrough */
if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
AVIStream *avist = s->streams[stream_index]->priv_data;
AVIOContext *pb = s->pb;
AVPacket *opkt = pkt;
int reshuffle_ret;
if (par->codec_id == AV_CODEC_ID_RAWVIDEO && par->codec_tag == 0) {
int64_t bpc = par->bits_per_coded_sample != 15 ? par->bits_per_coded_sample : 16;
int expected_stride = ((par->width * bpc + 31) >> 5)*4;
reshuffle_ret = ff_reshuffle_raw_rgb(s, &pkt, par, expected_stride);
if (reshuffle_ret < 0)
return reshuffle_ret;
} else
reshuffle_ret = 0;
if (par->format == AV_PIX_FMT_PAL8) {
ret = ff_get_packet_palette(s, opkt, reshuffle_ret, avist->palette);
if (ret < 0)
goto fail;
if (ret) {
int pal_size = 1 << par->bits_per_coded_sample;
int pc_tag, i;
av_assert0(par->bits_per_coded_sample >= 0 && par->bits_per_coded_sample <= 8);
if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && avist->pal_offset) {
int64_t cur_offset = avio_tell(pb);
avio_seek(pb, avist->pal_offset, SEEK_SET);
for (i = 0; i < pal_size; i++) {
uint32_t v = avist->palette[i];
avio_wl32(pb, v & 0xffffff);
}
avio_seek(pb, cur_offset, SEEK_SET);
memcpy(avist->old_palette, avist->palette, pal_size * 4);
avist->pal_offset = 0;
}
if (memcmp(avist->palette, avist->old_palette, pal_size * 4)) {
unsigned char tag[5];
avi_stream2fourcc(tag, stream_index, par->codec_type);
tag[2] = 'p'; tag[3] = 'c';
if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
if (avist->strh_flags_offset) {
int64_t cur_offset = avio_tell(pb);
avio_seek(pb, avist->strh_flags_offset, SEEK_SET);
avio_wl32(pb, AVISF_VIDEO_PALCHANGES);
avio_seek(pb, cur_offset, SEEK_SET);
avist->strh_flags_offset = 0;
}
ret = avi_add_ientry(s, stream_index, tag, AVIIF_NO_TIME,
pal_size * 4 + 4);
if (ret < 0)
goto fail;
}
pc_tag = ff_start_tag(pb, tag);
avio_w8(pb, 0);
avio_w8(pb, pal_size & 0xFF);
avio_wl16(pb, 0); // reserved
for (i = 0; i < pal_size; i++) {
uint32_t v = avist->palette[i];
avio_wb32(pb, v<<8);
}
ff_end_tag(pb, pc_tag);
memcpy(avist->old_palette, avist->palette, pal_size * 4);
}
}
}
if (reshuffle_ret) {
ret = avi_write_packet_internal(s, pkt);
fail:
if (reshuffle_ret)
av_packet_free(&pkt);
return ret;
}
}
return avi_write_packet_internal(s, pkt);
}
static int avi_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
{
unsigned char tag[5];
unsigned int flags = 0;
const int stream_index = pkt->stream_index;
int size = pkt->size;
AVIContext *avi = s->priv_data;
AVIOContext *pb = s->pb;
AVIStream *avist = s->streams[stream_index]->priv_data;
AVCodecParameters *par = s->streams[stream_index]->codecpar;
if (pkt->dts != AV_NOPTS_VALUE)
avist->last_dts = pkt->dts + pkt->duration;
avist->packet_count++;
// Make sure to put an OpenDML chunk when the file size exceeds the limits
if ((pb->seekable & AVIO_SEEKABLE_NORMAL) &&
(avio_tell(pb) - avi->riff_start > AVI_MAX_RIFF_SIZE)) {
avi_write_ix(s);
ff_end_tag(pb, avi->movi_list);
if (avi->riff_id == 1)
avi_write_idx1(s);
ff_end_tag(pb, avi->riff_start);
avi->movi_list = avi_start_new_riff(s, pb, "AVIX", "movi");
}
avi_stream2fourcc(tag, stream_index, par->codec_type);
if (pkt->flags & AV_PKT_FLAG_KEY)
flags = 0x10;
if (par->codec_type == AVMEDIA_TYPE_AUDIO)
avist->audio_strm_length += size;
if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
int ret;
ret = avi_add_ientry(s, stream_index, NULL, flags, size);
if (ret < 0)
return ret;
}
avio_write(pb, tag, 4);
avio_wl32(pb, size);
avio_write(pb, pkt->data, size);
if (size & 1)
avio_w8(pb, 0);
return 0;
}
static int avi_write_trailer(AVFormatContext *s)
{
AVIContext *avi = s->priv_data;
AVIOContext *pb = s->pb;
int res = 0;
int i, n, nb_frames;
int64_t file_size;
for (i = 0; i < s->nb_streams; i++) {
AVIStream *avist = s->streams[i]->priv_data;
write_skip_frames(s, i, avist->last_dts);
}
if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
if (avi->riff_id == 1) {
ff_end_tag(pb, avi->movi_list);
res = avi_write_idx1(s);
ff_end_tag(pb, avi->riff_start);
} else {
avi_write_ix(s);
ff_end_tag(pb, avi->movi_list);
ff_end_tag(pb, avi->riff_start);
file_size = avio_tell(pb);
avio_seek(pb, avi->odml_list - 8, SEEK_SET);
ffio_wfourcc(pb, "LIST"); /* Making this AVI OpenDML one */
avio_skip(pb, 16);
for (n = nb_frames = 0; n < s->nb_streams; n++) {
AVCodecParameters *par = s->streams[n]->codecpar;
AVIStream *avist = s->streams[n]->priv_data;
if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
if (nb_frames < avist->packet_count)
nb_frames = avist->packet_count;
} else {
if (par->codec_id == AV_CODEC_ID_MP2 ||
par->codec_id == AV_CODEC_ID_MP3)
nb_frames += avist->packet_count;
}
}
avio_wl32(pb, nb_frames);
avio_seek(pb, file_size, SEEK_SET);
avi_write_counters(s, avi->riff_id);
}
}
if (avi->riff_id >= avi->master_index_max_size) {
int index_space = AVI_MASTER_INDEX_PREFIX_SIZE +
AVI_MASTER_INDEX_ENTRY_SIZE * avi->riff_id;
av_log(s, AV_LOG_WARNING, "Output file not strictly OpenDML compliant, "
"consider re-muxing with 'reserve_index_space' option value >= %d\n",
index_space);
}
for (i = 0; i < s->nb_streams; i++) {
AVIStream *avist = s->streams[i]->priv_data;
if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
avio_seek(pb, avist->frames_hdr_strm + 4, SEEK_SET);
avio_wl32(pb, avist->max_size);
}
}
return res;
}
static void avi_deinit(AVFormatContext *s)
{
AVIContext *avi = s->priv_data;
av_packet_free(&avi->empty_packet);
for (int i = 0; i < s->nb_streams; i++) {
AVIStream *avist = s->streams[i]->priv_data;
if (!avist)
continue;
for (int j = 0; j < avist->indexes.ents_allocated / AVI_INDEX_CLUSTER_SIZE; j++)
av_freep(&avist->indexes.cluster[j]);
av_freep(&avist->indexes.cluster);
avist->indexes.ents_allocated = avist->indexes.entry = 0;
}
}
#define OFFSET(x) offsetof(AVIContext, x)
#define ENC AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "reserve_index_space", "reserve space (in bytes) at the beginning of the file for each stream index", OFFSET(reserve_index_space), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, ENC },
{ "write_channel_mask", "write channel mask into wave format header", OFFSET(write_channel_mask), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, ENC },
{ "flipped_raw_rgb", "Raw RGB bitmaps are stored bottom-up", OFFSET(flipped_raw_rgb), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, ENC },
{ NULL },
};
static const AVClass avi_muxer_class = {
.class_name = "AVI muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const AVOutputFormat ff_avi_muxer = {
.name = "avi",
.long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
.mime_type = "video/x-msvideo",
.extensions = "avi",
.priv_data_size = sizeof(AVIContext),
.audio_codec = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_AC3,
.video_codec = AV_CODEC_ID_MPEG4,
.init = avi_init,
.deinit = avi_deinit,
.write_header = avi_write_header,
.write_packet = avi_write_packet,
.write_trailer = avi_write_trailer,
.codec_tag = ff_riff_codec_tags_list,
.priv_class = &avi_muxer_class,
};
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