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ffmpeg/libavformat/avienc.c
Gyan Doshi 1ec2b3de5a avformat/riffenc: indicate storage of flipped RGB bitmaps 
Some legacy applications such as AVI2MVE expect raw RGB bitmaps
to be stored bottom-up, whereas our RIFF BITMAPINFOHEADER assumes
they are always stored top-down and thus write a negative value
for height. This can prevent reading of these files.

Option flipped_raw_rgb added to AVI and Matroska muxers
which will write positive value for height when enabled.

Note that the user has to flip the bitmaps beforehand using other
means such as the vflip filter.
2020-07-15 20:52:01 +05:30

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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;
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];
int j;
/* 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 */
avio_wl64(pb, 0); /* dwReserved[3] */
avio_wl32(pb, 0); /* Must be 0. */
for (j = 0; j < avi->master_index_max_size * 2; j++)
avio_wl64(pb, 0);
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);
}
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);
}
avio_wl32(pb, 0); /* reserved */
avio_wl32(pb, 0); /* reserved */
avio_wl32(pb, 0); /* reserved */
avio_wl32(pb, 0); /* 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);
for (i = 0; i < 248; i += 4)
avio_wl32(pb, 0);
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");
for (i = padding; i > 0; i -= 4)
avio_wl32(pb, 0);
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)
{
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) {
AVPacket empty_packet;
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);
}
av_init_packet(&empty_packet);
empty_packet.size = 0;
empty_packet.data = NULL;
empty_packet.stream_index = stream_index;
avi_write_packet_internal(s, &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)
{
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,
};
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 = (const AVCodecTag * const []) {
ff_codec_bmp_tags, ff_codec_wav_tags, 0
},
.priv_class = &avi_muxer_class,
};
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