Stowage/ffmpeg
2
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2026-04-18 16:40:23 +00:00
Code Issues Projects Releases Packages Wiki Activity
ffmpeg/libavformat/mlvdec.c
Sankalpa Sarkar 65eed0732c avformat: check avio_read() return values in dss/dtshd/mlv 
Multiple demuxers call avio_read() without checking its return
value. When input is truncated, destination buffers remain
uninitialized but are still used for offset calculations, memcmp,
and metadata handling. This results in undefined behavior
(detectable with Valgrind/MSan).

Fix this by checking the return value of avio_read() in:
- dss.c: dss_read_seek() — check before using header buffer
- dtshddec.c: FILEINFO chunk — check before using value buffer
- mlvdec.c: check_file_header() — check before memcmp on version

Fixes: #21520
2026-04-02 19:06:59 +00:00

643 lines
22 KiB
C
Raw Blame History

/*
* Magic Lantern Video (MLV) demuxer
* Copyright (c) 2014 Peter Ross
*
* 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
* Magic Lantern Video (MLV) demuxer
*/
#include <time.h>
#include "libavcodec/bytestream.h"
#include "libavcodec/tiff.h"
#include "libavcodec/tiff_common.h"
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "libavutil/rational.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#include "avio_internal.h"
#include "riff.h"
#define MLV_VERSION "v2.0"
#define MLV_VIDEO_CLASS_RAW 1
#define MLV_VIDEO_CLASS_YUV 2
#define MLV_VIDEO_CLASS_JPEG 3
#define MLV_VIDEO_CLASS_H264 4
#define MLV_AUDIO_CLASS_WAV 1
#define MLV_CLASS_FLAG_LJ92 0x20
#define MLV_CLASS_FLAG_DELTA 0x40
#define MLV_CLASS_FLAG_LZMA 0x80
typedef struct {
AVIOContext *pb[101];
int class[2];
int stream_index;
uint64_t pts;
int black_level;
int white_level;
int color_matrix1[9][2];
} MlvContext;
static int probe(const AVProbeData *p)
{
if (AV_RL32(p->buf) == MKTAG('M','L','V','I') &&
AV_RL32(p->buf + 4) >= 52 &&
!memcmp(p->buf + 8, MLV_VERSION, 5))
return AVPROBE_SCORE_MAX;
return 0;
}
static int check_file_header(AVIOContext *pb, uint64_t guid)
{
unsigned int size;
uint8_t version[8];
int ret;
avio_skip(pb, 4);
size = avio_rl32(pb);
if (size < 52)
return AVERROR_INVALIDDATA;
ret = ffio_read_size(pb, version, 8);
if (ret < 0)
return ret;
if (memcmp(version, MLV_VERSION, 5) || avio_rl64(pb) != guid)
return AVERROR_INVALIDDATA;
avio_skip(pb, size - 24);
return 0;
}
static void read_string(AVFormatContext *avctx, AVIOContext *pb, const char *tag, unsigned size)
{
char * value = av_malloc(size + 1);
int ret;
if (!value) {
avio_skip(pb, size);
return;
}
ret = avio_read(pb, value, size);
if (ret != size || !size || !value[0]) {
av_free(value);
return;
}
value[size] = 0;
av_dict_set(&avctx->metadata, tag, value, AV_DICT_DONT_STRDUP_VAL);
}
static void read_uint8(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
{
av_dict_set_int(&avctx->metadata, tag, avio_r8(pb), 0);
}
static void read_uint16(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
{
av_dict_set_int(&avctx->metadata, tag, avio_rl16(pb), 0);
}
static void read_uint32(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
{
av_dict_set_int(&avctx->metadata, tag, avio_rl32(pb), 0);
}
static void read_uint64(AVFormatContext *avctx, AVIOContext *pb, const char *tag, const char *fmt)
{
av_dict_set_int(&avctx->metadata, tag, avio_rl64(pb), 0);
}
static int scan_file(AVFormatContext *avctx, AVStream *vst, AVStream *ast, int file)
{
FFStream *const vsti = ffstream(vst), *const asti = ffstream(ast);
MlvContext *mlv = avctx->priv_data;
AVIOContext *pb = mlv->pb[file];
int ret;
while (!avio_feof(pb)) {
int type;
unsigned int size;
type = avio_rl32(pb);
size = avio_rl32(pb);
avio_skip(pb, 8); //timestamp
if (size < 16)
break;
size -= 16;
if (vst && type == MKTAG('R','A','W','I') && size >= 164) {
unsigned width = avio_rl16(pb);
unsigned height = avio_rl16(pb);
unsigned bits_per_coded_sample;
ret = av_image_check_size(width, height, 0, avctx);
if (ret < 0)
return ret;
if (avio_rl32(pb) != 1)
avpriv_request_sample(avctx, "raw api version");
avio_skip(pb, 20); // pointer, width, height, pitch, frame_size
bits_per_coded_sample = avio_rl32(pb);
if (bits_per_coded_sample > (INT_MAX - 7) / (width * height)) {
av_log(avctx, AV_LOG_ERROR,
"invalid bits_per_coded_sample %u (size: %ux%u)\n",
bits_per_coded_sample, width, height);
return AVERROR_INVALIDDATA;
}
vst->codecpar->width = width;
vst->codecpar->height = height;
vst->codecpar->bits_per_coded_sample = bits_per_coded_sample;
mlv->black_level = avio_rl32(pb);
mlv->white_level = avio_rl32(pb);
avio_skip(pb, 16 + 24); // xywh, active_area, exposure_bias
if (avio_rl32(pb) != 0x2010100) /* RGGB */
avpriv_request_sample(avctx, "cfa_pattern");
avio_skip(pb, 4); // calibration_illuminant1,
for (int i = 0; i < 9; i++) {
mlv->color_matrix1[i][0] = avio_rl32(pb);
mlv->color_matrix1[i][1] = avio_rl32(pb);
}
avio_skip(pb, 4); // dynamic_range
vst->codecpar->format = AV_PIX_FMT_BAYER_RGGB16LE;
vst->codecpar->codec_tag = MKTAG('B', 'I', 'T', 16);
size -= 164;
} else if (ast && type == MKTAG('W', 'A', 'V', 'I') && size >= 16) {
ret = ff_get_wav_header(avctx, pb, ast->codecpar, 16, 0);
if (ret < 0)
return ret;
size -= 16;
} else if (type == MKTAG('I','N','F','O')) {
if (size > 0)
read_string(avctx, pb, "info", size);
continue;
} else if (type == MKTAG('I','D','N','T') && size >= 36) {
read_string(avctx, pb, "cameraName", 32);
read_uint32(avctx, pb, "cameraModel", "0x%"PRIx32);
size -= 36;
if (size >= 32) {
read_string(avctx, pb, "cameraSerial", 32);
size -= 32;
}
} else if (type == MKTAG('L','E','N','S') && size >= 48) {
read_uint16(avctx, pb, "focalLength", "%i");
read_uint16(avctx, pb, "focalDist", "%i");
read_uint16(avctx, pb, "aperture", "%i");
read_uint8(avctx, pb, "stabilizerMode", "%i");
read_uint8(avctx, pb, "autofocusMode", "%i");
read_uint32(avctx, pb, "flags", "0x%"PRIx32);
read_uint32(avctx, pb, "lensID", "%"PRIi32);
read_string(avctx, pb, "lensName", 32);
size -= 48;
if (size >= 32) {
read_string(avctx, pb, "lensSerial", 32);
size -= 32;
}
} else if (vst && type == MKTAG('V', 'I', 'D', 'F') && size >= 4) {
uint64_t pts = avio_rl32(pb);
ff_add_index_entry(&vsti->index_entries, &vsti->nb_index_entries,
&vsti->index_entries_allocated_size,
avio_tell(pb) - 20, pts, file, 0, AVINDEX_KEYFRAME);
size -= 4;
} else if (ast && type == MKTAG('A', 'U', 'D', 'F') && size >= 4) {
uint64_t pts = avio_rl32(pb);
ff_add_index_entry(&asti->index_entries, &asti->nb_index_entries,
&asti->index_entries_allocated_size,
avio_tell(pb) - 20, pts, file, 0, AVINDEX_KEYFRAME);
size -= 4;
} else if (vst && type == MKTAG('W','B','A','L') && size >= 28) {
read_uint32(avctx, pb, "wb_mode", "%"PRIi32);
read_uint32(avctx, pb, "kelvin", "%"PRIi32);
read_uint32(avctx, pb, "wbgain_r", "%"PRIi32);
read_uint32(avctx, pb, "wbgain_g", "%"PRIi32);
read_uint32(avctx, pb, "wbgain_b", "%"PRIi32);
read_uint32(avctx, pb, "wbs_gm", "%"PRIi32);
read_uint32(avctx, pb, "wbs_ba", "%"PRIi32);
size -= 28;
} else if (type == MKTAG('R','T','C','I') && size >= 20) {
char str[32];
struct tm time = { 0 };
time.tm_sec = avio_rl16(pb);
time.tm_min = avio_rl16(pb);
time.tm_hour = avio_rl16(pb);
time.tm_mday = avio_rl16(pb);
time.tm_mon = avio_rl16(pb);
time.tm_year = avio_rl16(pb);
time.tm_wday = avio_rl16(pb);
time.tm_yday = avio_rl16(pb);
time.tm_isdst = avio_rl16(pb);
avio_skip(pb, 2);
if (strftime(str, sizeof(str), "%Y-%m-%d %H:%M:%S", &time))
av_dict_set(&avctx->metadata, "time", str, 0);
size -= 20;
} else if (type == MKTAG('E','X','P','O') && size >= 16) {
av_dict_set(&avctx->metadata, "isoMode", avio_rl32(pb) ? "auto" : "manual", 0);
read_uint32(avctx, pb, "isoValue", "%"PRIi32);
read_uint32(avctx, pb, "isoAnalog", "%"PRIi32);
read_uint32(avctx, pb, "digitalGain", "%"PRIi32);
size -= 16;
if (size >= 8) {
read_uint64(avctx, pb, "shutterValue", "%"PRIi64);
size -= 8;
}
} else if (type == MKTAG('S','T','Y','L') && size >= 36) {
read_uint32(avctx, pb, "picStyleId", "%"PRIi32);
read_uint32(avctx, pb, "contrast", "%"PRIi32);
read_uint32(avctx, pb, "sharpness", "%"PRIi32);
read_uint32(avctx, pb, "saturation", "%"PRIi32);
read_uint32(avctx, pb, "colortone", "%"PRIi32);
read_string(avctx, pb, "picStyleName", 16);
size -= 36;
} else if (type == MKTAG('V','E','R','S') && size >= 4) {
unsigned int length = avio_rl32(pb);
read_string(avctx, pb, "version", length);
size -= length + 4;
} else if (type == MKTAG('D','A','R','K')) {
} else if (type == MKTAG('D','I','S','O')) {
} else if (type == MKTAG('M','A','R','K')) {
} else if (type == MKTAG('N','U','L','L')) {
} else if (type == MKTAG('M','L','V','I')) { /* occurs when MLV and Mnn files are concatenated */
} else if (type == MKTAG('R','A','W','C')) {
} else {
av_log(avctx, AV_LOG_INFO, "unsupported tag %s, size %u\n",
av_fourcc2str(type), size);
}
avio_skip(pb, size);
}
return 0;
}
static int read_header(AVFormatContext *avctx)
{
MlvContext *mlv = avctx->priv_data;
AVIOContext *pb = avctx->pb;
AVStream *vst = NULL, *ast = NULL;
FFStream *vsti = NULL, *asti = NULL;
int size, ret;
unsigned nb_video_frames, nb_audio_frames;
uint64_t guid;
char guidstr[32];
avio_skip(pb, 4);
size = avio_rl32(pb);
if (size < 52)
return AVERROR_INVALIDDATA;
avio_skip(pb, 8);
guid = avio_rl64(pb);
snprintf(guidstr, sizeof(guidstr), "0x%"PRIx64, guid);
av_dict_set(&avctx->metadata, "guid", guidstr, 0);
avio_skip(pb, 8); //fileNum, fileCount, fileFlags
mlv->class[0] = avio_rl16(pb);
mlv->class[1] = avio_rl16(pb);
nb_video_frames = avio_rl32(pb);
nb_audio_frames = avio_rl32(pb);
if (nb_video_frames && mlv->class[0]) {
vst = avformat_new_stream(avctx, NULL);
if (!vst)
return AVERROR(ENOMEM);
vsti = ffstream(vst);
vst->id = 0;
vst->nb_frames = nb_video_frames;
if ((mlv->class[0] & (MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA)))
avpriv_request_sample(avctx, "compression");
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
switch (mlv->class[0] & ~(MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA)) {
case MLV_VIDEO_CLASS_RAW:
vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
break;
case MLV_VIDEO_CLASS_YUV:
vst->codecpar->format = AV_PIX_FMT_YUV420P;
vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
vst->codecpar->codec_tag = 0;
break;
case MLV_CLASS_FLAG_LJ92|MLV_VIDEO_CLASS_RAW:
vst->codecpar->codec_id = AV_CODEC_ID_TIFF;
break;
case MLV_VIDEO_CLASS_JPEG:
vst->codecpar->codec_id = AV_CODEC_ID_MJPEG;
vst->codecpar->codec_tag = 0;
break;
case MLV_VIDEO_CLASS_H264:
vst->codecpar->codec_id = AV_CODEC_ID_H264;
vst->codecpar->codec_tag = 0;
break;
default:
avpriv_request_sample(avctx, "unknown video class");
}
}
if (nb_audio_frames && mlv->class[1]) {
ast = avformat_new_stream(avctx, NULL);
if (!ast)
return AVERROR(ENOMEM);
asti = ffstream(ast);
ast->id = 1;
ast->nb_frames = nb_audio_frames;
if ((mlv->class[1] & MLV_CLASS_FLAG_LZMA))
avpriv_request_sample(avctx, "compression");
if ((mlv->class[1] & ~MLV_CLASS_FLAG_LZMA) != MLV_AUDIO_CLASS_WAV)
avpriv_request_sample(avctx, "unknown audio class");
ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
}
if (vst) {
AVRational framerate;
framerate.num = avio_rl32(pb);
framerate.den = avio_rl32(pb);
avpriv_set_pts_info(vst, 64, framerate.den, framerate.num);
} else
avio_skip(pb, 8);
avio_skip(pb, size - 52);
/* scan primary file */
mlv->pb[100] = avctx->pb;
ret = scan_file(avctx, vst, ast, 100);
if (ret < 0)
return ret;
/* scan secondary files */
if (strlen(avctx->url) > 2) {
int i;
char *filename = av_strdup(avctx->url);
if (!filename)
return AVERROR(ENOMEM);
for (i = 0; i < 100; i++) {
snprintf(filename + strlen(filename) - 2, 3, "%02d", i);
if (avctx->io_open(avctx, &mlv->pb[i], filename, AVIO_FLAG_READ, NULL) < 0)
break;
if (check_file_header(mlv->pb[i], guid) < 0) {
av_log(avctx, AV_LOG_WARNING, "ignoring %s; bad format or guid mismatch\n", filename);
ff_format_io_close(avctx, &mlv->pb[i]);
continue;
}
av_log(avctx, AV_LOG_INFO, "scanning %s\n", filename);
ret = scan_file(avctx, vst, ast, i);
if (ret < 0) {
av_log(avctx, AV_LOG_WARNING, "ignoring %s; %s\n", filename, av_err2str(ret));
ff_format_io_close(avctx, &mlv->pb[i]);
continue;
}
}
av_free(filename);
}
if (vst)
vst->duration = vsti->nb_index_entries;
if (ast)
ast->duration = asti->nb_index_entries;
if ((vst && !vsti->nb_index_entries) || (ast && !asti->nb_index_entries)) {
av_log(avctx, AV_LOG_ERROR, "no index entries found\n");
return AVERROR_INVALIDDATA;
}
if (vst && ast)
avio_seek(pb, FFMIN(vsti->index_entries[0].pos, asti->index_entries[0].pos), SEEK_SET);
else if (vst)
avio_seek(pb, vsti->index_entries[0].pos, SEEK_SET);
else if (ast)
avio_seek(pb, asti->index_entries[0].pos, SEEK_SET);
return 0;
}
static void write_tiff_short(PutByteContext *pb, int tag, int value)
{
bytestream2_put_le16(pb, tag);
bytestream2_put_le16(pb, AV_TIFF_SHORT);
bytestream2_put_le32(pb, 1);
bytestream2_put_le16(pb, value);
bytestream2_put_le16(pb, 0);
}
static void write_tiff_short2(PutByteContext *pb, int tag, int v1, int v2)
{
bytestream2_put_le16(pb, tag);
bytestream2_put_le16(pb, AV_TIFF_SHORT);
bytestream2_put_le32(pb, 2);
bytestream2_put_le16(pb, v1);
bytestream2_put_le16(pb, v2);
}
static void write_tiff_long(PutByteContext *pb, int tag, int value)
{
bytestream2_put_le16(pb, tag);
bytestream2_put_le16(pb, AV_TIFF_LONG);
bytestream2_put_le32(pb, 1);
bytestream2_put_le32(pb, value);
}
static void write_tiff_byte4(PutByteContext *pb, int tag, int v1, int v2, int v3, int v4)
{
bytestream2_put_le16(pb, tag);
bytestream2_put_le16(pb, AV_TIFF_BYTE);
bytestream2_put_le32(pb, 4);
bytestream2_put_byte(pb, v1);
bytestream2_put_byte(pb, v2);
bytestream2_put_byte(pb, v3);
bytestream2_put_byte(pb, v4);
}
static int get_packet_lj92(AVFormatContext *avctx, AVStream *st, AVIOContext *pbio, AVPacket *pkt, int64_t size)
{
MlvContext *mlv = avctx->priv_data;
PutByteContext pbctx, *pb = &pbctx;
int ret, header_size;
uint8_t *stripofs, *matrixofs;
#define MAX_HEADER_SIZE 2048
if ((uint64_t)size > INT32_MAX - MAX_HEADER_SIZE)
return AVERROR_PATCHWELCOME;
if ((ret = av_new_packet(pkt, size + MAX_HEADER_SIZE)) < 0)
return ret;
bytestream2_init_writer(pb, pkt->data, MAX_HEADER_SIZE);
bytestream2_put_le16(pb, 0x4949);
bytestream2_put_le16(pb, 42);
bytestream2_put_le32(pb, 8);
bytestream2_put_le16(pb, 18); /* nb_entries */
write_tiff_long(pb, TIFF_SUBFILE, 0);
write_tiff_long(pb, TIFF_WIDTH, st->codecpar->width);
write_tiff_long(pb, TIFF_HEIGHT, st->codecpar->height);
write_tiff_long(pb, TIFF_BPP, st->codecpar->bits_per_coded_sample);
write_tiff_short(pb, TIFF_COMPR, TIFF_NEWJPEG);
write_tiff_short(pb, TIFF_PHOTOMETRIC, TIFF_PHOTOMETRIC_CFA);
write_tiff_short(pb, TIFF_FILL_ORDER, 1);
write_tiff_long(pb, TIFF_STRIP_OFFS, 0); /* stripofs */
stripofs = pb->buffer - 4;
write_tiff_long(pb, TIFF_SAMPLES_PER_PIXEL, 1);
write_tiff_short(pb, TIFF_ROWSPERSTRIP, st->codecpar->height);
write_tiff_long(pb, TIFF_STRIP_SIZE, size);
write_tiff_short(pb, TIFF_PLANAR, 1);
write_tiff_short2(pb, TIFF_CFA_PATTERN_DIM, 2, 2);
write_tiff_byte4(pb, TIFF_CFA_PATTERN, 0, 1, 1, 2);
write_tiff_byte4(pb, DNG_VERSION, 1, 4, 0, 0);
write_tiff_long(pb, DNG_BLACK_LEVEL, mlv->black_level);
write_tiff_long(pb, DNG_WHITE_LEVEL, mlv->white_level);
bytestream2_put_le16(pb, DNG_COLOR_MATRIX1);
bytestream2_put_le16(pb, AV_TIFF_SRATIONAL);
bytestream2_put_le32(pb, 9);
bytestream2_put_le32(pb, 0); /* matrixofs */
matrixofs = pb->buffer - 4;
bytestream2_put_le32(pb, 0);
AV_WL32(matrixofs, bytestream2_tell_p(pb));
for (int i = 0; i < 9; i++) {
bytestream2_put_le32(pb, mlv->color_matrix1[i][0]);
bytestream2_put_le32(pb, mlv->color_matrix1[i][1]);
}
header_size = bytestream2_tell_p(pb);
AV_WL32(stripofs, header_size);
ret = avio_read(pbio, pkt->data + header_size, size);
if (ret < 0)
return ret;
return 0;
}
static int read_packet(AVFormatContext *avctx, AVPacket *pkt)
{
MlvContext *mlv = avctx->priv_data;
AVIOContext *pb;
AVStream *st;
FFStream *sti;
int index, ret;
unsigned int size, space;
if (!avctx->nb_streams)
return AVERROR_EOF;
st = avctx->streams[mlv->stream_index];
sti = ffstream(st);
if (mlv->pts >= st->duration)
return AVERROR_EOF;
index = av_index_search_timestamp(st, mlv->pts, AVSEEK_FLAG_ANY);
if (index < 0) {
av_log(avctx, AV_LOG_ERROR, "could not find index entry for frame %"PRId64"\n", mlv->pts);
return AVERROR_INVALIDDATA;
}
pb = mlv->pb[sti->index_entries[index].size];
if (!pb) {
ret = FFERROR_REDO;
goto next_packet;
}
avio_seek(pb, sti->index_entries[index].pos, SEEK_SET);
avio_skip(pb, 4); // blockType
size = avio_rl32(pb);
if (size < 16)
return AVERROR_INVALIDDATA;
avio_skip(pb, 12); //timestamp, frameNumber
size -= 12;
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
if (size < 8)
return AVERROR_INVALIDDATA;
avio_skip(pb, 8); // cropPosX, cropPosY, panPosX, panPosY
size -= 8;
}
space = avio_rl32(pb);
if (size < space + 4LL)
return AVERROR_INVALIDDATA;
avio_skip(pb, space);
size -= space;
if ((mlv->class[st->id] & (MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA))) {
ret = AVERROR_PATCHWELCOME;
} else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
if (st->codecpar->codec_id == AV_CODEC_ID_TIFF)
ret = get_packet_lj92(avctx, st, pb, pkt, size);
else
ret = av_get_packet(pb, pkt, (st->codecpar->width * st->codecpar->height * st->codecpar->bits_per_coded_sample + 7) >> 3);
} else { // AVMEDIA_TYPE_AUDIO
ret = av_get_packet(pb, pkt, size - 4);
}
if (ret < 0)
return ret;
pkt->stream_index = mlv->stream_index;
pkt->pts = mlv->pts;
ret = 0;
next_packet:
mlv->stream_index++;
if (mlv->stream_index == avctx->nb_streams) {
mlv->stream_index = 0;
mlv->pts++;
}
return ret;
}
static int read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
{
MlvContext *mlv = avctx->priv_data;
if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
return AVERROR(ENOSYS);
if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
return AVERROR(ENOSYS);
mlv->pts = timestamp;
return 0;
}
static int read_close(AVFormatContext *s)
{
MlvContext *mlv = s->priv_data;
int i;
for (i = 0; i < 100; i++)
ff_format_io_close(s, &mlv->pb[i]);
return 0;
}
const FFInputFormat ff_mlv_demuxer = {
.p.name = "mlv",
.p.long_name = NULL_IF_CONFIG_SMALL("Magic Lantern Video (MLV)"),
.priv_data_size = sizeof(MlvContext),
.flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
.read_probe = probe,
.read_header = read_header,
.read_packet = read_packet,
.read_close = read_close,
.read_seek = read_seek,
};
Reference in a new issue View git blame Copy permalink