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FFmpeg/libavfilter/src_movie.c
Stefano Sabatini 52bd9cb4d2 lavfi/movie: force channel layout if not set by the decoder 
This ensures that the output buffers will have the channel layout set,
which is required by filters.

Also consistent with ffmpeg.c behavior.
2012-07-31 13:25:14 +02:00

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/*
* Copyright (c) 2010 Stefano Sabatini
* Copyright (c) 2008 Victor Paesa
*
* 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
* movie video source
*
* @todo use direct rendering (no allocation of a new frame)
* @todo support a PTS correction mechanism
*/
/* #define DEBUG */
#include <float.h>
#include "libavutil/avstring.h"
#include "libavutil/avassert.h"
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "libavutil/timestamp.h"
#include "libavformat/avformat.h"
#include "audio.h"
#include "avcodec.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct {
AVStream *st;
int done;
} MovieStream;
typedef struct {
/* common A/V fields */
const AVClass *class;
int64_t seek_point; ///< seekpoint in microseconds
double seek_point_d;
char *format_name;
char *file_name;
char *stream_specs; /**< user-provided list of streams, separated by + */
int stream_index; /**< for compatibility */
int loop_count;
AVFormatContext *format_ctx;
int eof;
AVPacket pkt, pkt0;
AVFrame *frame; ///< video frame to store the decoded images in
int max_stream_index; /**< max stream # actually used for output */
MovieStream *st; /**< array of all streams, one per output */
int *out_index; /**< stream number -> output number map, or -1 */
} MovieContext;
#define OFFSET(x) offsetof(MovieContext, x)
static const AVOption movie_options[]= {
{"format_name", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MIN, CHAR_MAX },
{"f", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MIN, CHAR_MAX },
{"streams", "set streams", OFFSET(stream_specs), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MAX, CHAR_MAX },
{"s", "set streams", OFFSET(stream_specs), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MAX, CHAR_MAX },
{"si", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, {.dbl = -1}, -1, INT_MAX },
{"stream_index", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, {.dbl = -1}, -1, INT_MAX },
{"seek_point", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, {.dbl = 0}, 0, (INT64_MAX-1) / 1000000 },
{"sp", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, {.dbl = 0}, 0, (INT64_MAX-1) / 1000000 },
{"loop", "set loop count", OFFSET(loop_count), AV_OPT_TYPE_INT, {.dbl = 1}, 0, INT_MAX },
{NULL},
};
AVFILTER_DEFINE_CLASS(movie);
static int movie_config_output_props(AVFilterLink *outlink);
static int movie_request_frame(AVFilterLink *outlink);
static AVStream *find_stream(void *log, AVFormatContext *avf, const char *spec)
{
int i, ret, already = 0, stream_id = -1;
char type_char, dummy;
AVStream *found = NULL;
enum AVMediaType type;
ret = sscanf(spec, "d%[av]%d%c", &type_char, &stream_id, &dummy);
if (ret >= 1 && ret <= 2) {
type = type_char == 'v' ? AVMEDIA_TYPE_VIDEO : AVMEDIA_TYPE_AUDIO;
ret = av_find_best_stream(avf, type, stream_id, -1, NULL, 0);
if (ret < 0) {
av_log(log, AV_LOG_ERROR, "No %s stream with index '%d' found\n",
av_get_media_type_string(type), stream_id);
return NULL;
}
return avf->streams[ret];
}
for (i = 0; i < avf->nb_streams; i++) {
ret = avformat_match_stream_specifier(avf, avf->streams[i], spec);
if (ret < 0) {
av_log(log, AV_LOG_ERROR,
"Invalid stream specifier \"%s\"\n", spec);
return NULL;
}
if (!ret)
continue;
if (avf->streams[i]->discard != AVDISCARD_ALL) {
already++;
continue;
}
if (found) {
av_log(log, AV_LOG_WARNING,
"Ambiguous stream specifier \"%s\", using #%d\n", spec, i);
break;
}
found = avf->streams[i];
}
if (!found) {
av_log(log, AV_LOG_WARNING, "Stream specifier \"%s\" %s\n", spec,
already ? "matched only already used streams" :
"did not match any stream");
return NULL;
}
if (found->codec->codec_type != AVMEDIA_TYPE_VIDEO &&
found->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
av_log(log, AV_LOG_ERROR, "Stream specifier \"%s\" matched a %s stream,"
"currently unsupported by libavfilter\n", spec,
av_get_media_type_string(found->codec->codec_type));
return NULL;
}
return found;
}
static int open_stream(void *log, MovieStream *st)
{
AVCodec *codec;
int ret;
codec = avcodec_find_decoder(st->st->codec->codec_id);
if (!codec) {
av_log(log, AV_LOG_ERROR, "Failed to find any codec\n");
return AVERROR(EINVAL);
}
if ((ret = avcodec_open2(st->st->codec, codec, NULL)) < 0) {
av_log(log, AV_LOG_ERROR, "Failed to open codec\n");
return ret;
}
return 0;
}
static int guess_channel_layout(MovieStream *st, int st_index, void *log_ctx)
{
AVCodecContext *dec_ctx = st->st->codec;
char buf[256];
int64_t chl = av_get_default_channel_layout(dec_ctx->channels);
if (!chl) {
av_log(log_ctx, AV_LOG_ERROR,
"Channel layout is not set in stream %d, and could not "
"be guessed from the number of channels (%d)\n",
st_index, dec_ctx->channels);
return AVERROR(EINVAL);
}
av_get_channel_layout_string(buf, sizeof(buf), dec_ctx->channels, chl);
av_log(log_ctx, AV_LOG_WARNING,
"Channel layout is not set in output stream %d, "
"guessed channel layout is '%s'\n",
st_index, buf);
dec_ctx->channel_layout = chl;
return 0;
}
static av_cold int movie_init(AVFilterContext *ctx, const char *args)
{
MovieContext *movie = ctx->priv;
AVInputFormat *iformat = NULL;
int64_t timestamp;
int nb_streams, ret, i;
char default_streams[16], *stream_specs, *spec, *cursor;
char name[16];
AVStream *st;
movie->class = &movie_class;
av_opt_set_defaults(movie);
if (args)
movie->file_name = av_get_token(&args, ":");
if (!movie->file_name || !*movie->file_name) {
av_log(ctx, AV_LOG_ERROR, "No filename provided!\n");
return AVERROR(EINVAL);
}
if (*args++ == ':' && (ret = av_set_options_string(movie, args, "=", ":")) < 0) {
av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
return ret;
}
movie->seek_point = movie->seek_point_d * 1000000 + 0.5;
stream_specs = movie->stream_specs;
if (!stream_specs) {
snprintf(default_streams, sizeof(default_streams), "d%c%d",
!strcmp(ctx->filter->name, "amovie") ? 'a' : 'v',
movie->stream_index);
stream_specs = default_streams;
}
for (cursor = stream_specs, nb_streams = 1; *cursor; cursor++)
if (*cursor == '+')
nb_streams++;
if (movie->loop_count != 1 && nb_streams != 1) {
av_log(ctx, AV_LOG_ERROR,
"Loop with several streams is currently unsupported\n");
return AVERROR_PATCHWELCOME;
}
av_register_all();
// Try to find the movie format (container)
iformat = movie->format_name ? av_find_input_format(movie->format_name) : NULL;
movie->format_ctx = NULL;
if ((ret = avformat_open_input(&movie->format_ctx, movie->file_name, iformat, NULL)) < 0) {
av_log(ctx, AV_LOG_ERROR,
"Failed to avformat_open_input '%s'\n", movie->file_name);
return ret;
}
if ((ret = avformat_find_stream_info(movie->format_ctx, NULL)) < 0)
av_log(ctx, AV_LOG_WARNING, "Failed to find stream info\n");
// if seeking requested, we execute it
if (movie->seek_point > 0) {
timestamp = movie->seek_point;
// add the stream start time, should it exist
if (movie->format_ctx->start_time != AV_NOPTS_VALUE) {
if (timestamp > INT64_MAX - movie->format_ctx->start_time) {
av_log(ctx, AV_LOG_ERROR,
"%s: seek value overflow with start_time:%"PRId64" seek_point:%"PRId64"\n",
movie->file_name, movie->format_ctx->start_time, movie->seek_point);
return AVERROR(EINVAL);
}
timestamp += movie->format_ctx->start_time;
}
if ((ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD)) < 0) {
av_log(ctx, AV_LOG_ERROR, "%s: could not seek to position %"PRId64"\n",
movie->file_name, timestamp);
return ret;
}
}
for (i = 0; i < movie->format_ctx->nb_streams; i++)
movie->format_ctx->streams[i]->discard = AVDISCARD_ALL;
movie->st = av_calloc(nb_streams, sizeof(*movie->st));
if (!movie->st)
return AVERROR(ENOMEM);
for (i = 0; i < nb_streams; i++) {
spec = av_strtok(stream_specs, "+", &cursor);
if (!spec)
return AVERROR_BUG;
stream_specs = NULL; /* for next strtok */
st = find_stream(ctx, movie->format_ctx, spec);
if (!st)
return AVERROR(EINVAL);
st->discard = AVDISCARD_DEFAULT;
movie->st[i].st = st;
movie->max_stream_index = FFMAX(movie->max_stream_index, st->index);
}
if (av_strtok(NULL, "+", &cursor))
return AVERROR_BUG;
movie->out_index = av_calloc(movie->max_stream_index + 1,
sizeof(*movie->out_index));
if (!movie->out_index)
return AVERROR(ENOMEM);
for (i = 0; i <= movie->max_stream_index; i++)
movie->out_index[i] = -1;
for (i = 0; i < nb_streams; i++)
movie->out_index[movie->st[i].st->index] = i;
for (i = 0; i < nb_streams; i++) {
AVFilterPad pad = { 0 };
snprintf(name, sizeof(name), "out%d", i);
pad.type = movie->st[i].st->codec->codec_type;
pad.name = av_strdup(name);
pad.config_props = movie_config_output_props;
pad.request_frame = movie_request_frame;
ff_insert_outpad(ctx, i, &pad);
ret = open_stream(ctx, &movie->st[i]);
if (ret < 0)
return ret;
if ( movie->st[i].st->codec->codec->type == AVMEDIA_TYPE_AUDIO &&
!movie->st[i].st->codec->channel_layout) {
ret = guess_channel_layout(&movie->st[i], i, ctx);
if (ret < 0)
return ret;
}
}
if (!(movie->frame = avcodec_alloc_frame()) ) {
av_log(log, AV_LOG_ERROR, "Failed to alloc frame\n");
return AVERROR(ENOMEM);
}
av_log(ctx, AV_LOG_VERBOSE, "seek_point:%"PRIi64" format_name:%s file_name:%s stream_index:%d\n",
movie->seek_point, movie->format_name, movie->file_name,
movie->stream_index);
return 0;
}
static av_cold void movie_uninit(AVFilterContext *ctx)
{
MovieContext *movie = ctx->priv;
int i;
for (i = 0; i < ctx->nb_outputs; i++) {
av_freep(&ctx->output_pads[i].name);
if (movie->st[i].st)
avcodec_close(movie->st[i].st->codec);
}
av_opt_free(movie);
av_freep(&movie->file_name);
av_freep(&movie->st);
av_freep(&movie->out_index);
av_freep(&movie->frame);
if (movie->format_ctx)
avformat_close_input(&movie->format_ctx);
}
static int movie_query_formats(AVFilterContext *ctx)
{
MovieContext *movie = ctx->priv;
int list[] = { 0, -1 };
int64_t list64[] = { 0, -1 };
int i;
for (i = 0; i < ctx->nb_outputs; i++) {
MovieStream *st = &movie->st[i];
AVCodecContext *c = st->st->codec;
AVFilterLink *outlink = ctx->outputs[i];
switch (c->codec_type) {
case AVMEDIA_TYPE_VIDEO:
list[0] = c->pix_fmt;
ff_formats_ref(ff_make_format_list(list), &outlink->in_formats);
break;
case AVMEDIA_TYPE_AUDIO:
list[0] = c->sample_fmt;
ff_formats_ref(ff_make_format_list(list), &outlink->in_formats);
list[0] = c->sample_rate;
ff_formats_ref(ff_make_format_list(list), &outlink->in_samplerates);
list64[0] = c->channel_layout;
ff_channel_layouts_ref(avfilter_make_format64_list(list64),
&outlink->in_channel_layouts);
break;
}
}
return 0;
}
static int movie_config_output_props(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
MovieContext *movie = ctx->priv;
unsigned out_id = FF_OUTLINK_IDX(outlink);
MovieStream *st = &movie->st[out_id];
AVCodecContext *c = st->st->codec;
outlink->time_base = st->st->time_base;
switch (c->codec_type) {
case AVMEDIA_TYPE_VIDEO:
outlink->w = c->width;
outlink->h = c->height;
outlink->frame_rate = st->st->r_frame_rate;
break;
case AVMEDIA_TYPE_AUDIO:
break;
}
return 0;
}
static AVFilterBufferRef *frame_to_buf(enum AVMediaType type, AVFrame *frame,
AVFilterLink *outlink)
{
AVFilterBufferRef *buf, *copy;
buf = avfilter_get_buffer_ref_from_frame(type, frame,
AV_PERM_WRITE |
AV_PERM_PRESERVE |
AV_PERM_REUSE2);
if (!buf)
return NULL;
buf->pts = av_frame_get_best_effort_timestamp(frame);
copy = ff_copy_buffer_ref(outlink, buf);
if (!copy)
return NULL;
buf->buf->data[0] = NULL; /* it belongs to the frame */
avfilter_unref_buffer(buf);
return copy;
}
static char *describe_bufref_to_str(char *dst, size_t dst_size,
AVFilterBufferRef *buf,
AVFilterLink *link)
{
switch (buf->type) {
case AVMEDIA_TYPE_VIDEO:
snprintf(dst, dst_size,
"video pts:%s time:%s pos:%"PRId64" size:%dx%d aspect:%d/%d",
av_ts2str(buf->pts), av_ts2timestr(buf->pts, &link->time_base),
buf->pos, buf->video->w, buf->video->h,
buf->video->sample_aspect_ratio.num,
buf->video->sample_aspect_ratio.den);
break;
case AVMEDIA_TYPE_AUDIO:
snprintf(dst, dst_size,
"audio pts:%s time:%s pos:%"PRId64" samples:%d",
av_ts2str(buf->pts), av_ts2timestr(buf->pts, &link->time_base),
buf->pos, buf->audio->nb_samples);
break;
default:
snprintf(dst, dst_size, "%s BUG", av_get_media_type_string(buf->type));
break;
}
return dst;
}
#define describe_bufref(buf, link) \
describe_bufref_to_str((char[1024]){0}, 1024, buf, link)
static int rewind_file(AVFilterContext *ctx)
{
MovieContext *movie = ctx->priv;
int64_t timestamp = movie->seek_point;
int ret, i;
if (movie->format_ctx->start_time != AV_NOPTS_VALUE)
timestamp += movie->format_ctx->start_time;
ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR, "Unable to loop: %s\n", av_err2str(ret));
movie->loop_count = 1; /* do not try again */
return ret;
}
for (i = 0; i < ctx->nb_outputs; i++) {
avcodec_flush_buffers(movie->st[i].st->codec);
movie->st[i].done = 0;
}
movie->eof = 0;
return 0;
}
/**
* Try to push a frame to the requested output.
*
* @return 1 if a frame was pushed on the requested output,
* 0 if another attempt is possible,
* <0 AVERROR code
*/
static int movie_push_frame(AVFilterContext *ctx, unsigned out_id)
{
MovieContext *movie = ctx->priv;
AVPacket *pkt = &movie->pkt;
MovieStream *st;
int ret, got_frame = 0, pkt_out_id;
AVFilterLink *outlink;
AVFilterBufferRef *buf;
if (!pkt->size) {
if (movie->eof) {
if (movie->st[out_id].done) {
if (movie->loop_count != 1) {
ret = rewind_file(ctx);
if (ret < 0)
return ret;
movie->loop_count -= movie->loop_count > 1;
av_log(ctx, AV_LOG_VERBOSE, "Stream finished, looping.\n");
return 0; /* retry */
}
return AVERROR_EOF;
}
/* packet is already ready for flushing */
} else {
ret = av_read_frame(movie->format_ctx, &movie->pkt0);
if (ret < 0) {
av_init_packet(&movie->pkt0); /* ready for flushing */
*pkt = movie->pkt0;
if (ret == AVERROR_EOF) {
movie->eof = 1;
return 0; /* start flushing */
}
return ret;
}
*pkt = movie->pkt0;
}
}
pkt_out_id = pkt->stream_index > movie->max_stream_index ? -1 :
movie->out_index[pkt->stream_index];
if (pkt_out_id < 0) {
av_free_packet(&movie->pkt0);
pkt->size = 0; /* ready for next run */
pkt->data = NULL;
return 0;
}
st = &movie->st[pkt_out_id];
outlink = ctx->outputs[pkt_out_id];
switch (st->st->codec->codec_type) {
case AVMEDIA_TYPE_VIDEO:
ret = avcodec_decode_video2(st->st->codec, movie->frame, &got_frame, pkt);
break;
case AVMEDIA_TYPE_AUDIO:
ret = avcodec_decode_audio4(st->st->codec, movie->frame, &got_frame, pkt);
break;
default:
ret = AVERROR(ENOSYS);
break;
}
if (ret < 0) {
av_log(ctx, AV_LOG_WARNING, "Decode error: %s\n", av_err2str(ret));
return 0;
}
if (!ret)
ret = pkt->size;
pkt->data += ret;
pkt->size -= ret;
if (pkt->size <= 0) {
av_free_packet(&movie->pkt0);
pkt->size = 0; /* ready for next run */
pkt->data = NULL;
}
if (!got_frame) {
if (!ret)
st->done = 1;
return 0;
}
buf = frame_to_buf(st->st->codec->codec_type, movie->frame, outlink);
if (!buf)
return AVERROR(ENOMEM);
av_dlog(ctx, "movie_push_frame(): file:'%s' %s\n", movie->file_name,
describe_bufref(buf, outlink));
switch (st->st->codec->codec_type) {
case AVMEDIA_TYPE_VIDEO:
if (!movie->frame->sample_aspect_ratio.num)
buf->video->sample_aspect_ratio = st->st->sample_aspect_ratio;
ff_start_frame(outlink, buf);
ff_draw_slice(outlink, 0, outlink->h, 1);
ff_end_frame(outlink);
break;
case AVMEDIA_TYPE_AUDIO:
ff_filter_samples(outlink, buf);
break;
}
return pkt_out_id == out_id;
}
static int movie_request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
unsigned out_id = FF_OUTLINK_IDX(outlink);
int ret;
while (1) {
ret = movie_push_frame(ctx, out_id);
if (ret)
return FFMIN(ret, 0);
}
}
#if CONFIG_MOVIE_FILTER
AVFilter avfilter_avsrc_movie = {
.name = "movie",
.description = NULL_IF_CONFIG_SMALL("Read from a movie source."),
.priv_size = sizeof(MovieContext),
.init = movie_init,
.uninit = movie_uninit,
.query_formats = movie_query_formats,
.inputs = (const AVFilterPad[]) {{ .name = NULL }},
.outputs = (const AVFilterPad[]) {{ .name = NULL }},
};
#endif /* CONFIG_MOVIE_FILTER */
#if CONFIG_AMOVIE_FILTER
AVFilter avfilter_avsrc_amovie = {
.name = "amovie",
.description = NULL_IF_CONFIG_SMALL("Read audio from a movie source."),
.priv_size = sizeof(MovieContext),
.init = movie_init,
.uninit = movie_uninit,
.query_formats = movie_query_formats,
.inputs = (const AVFilterPad[]) {{ .name = NULL }},
.outputs = (const AVFilterPad[]) {{ .name = NULL }},
};
#endif /* CONFIG_AMOVIE_FILTER */
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