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FFmpeg/libavfilter/src_movie.c
Lukasz Marek f753956252 lavfi/src_movie: minor simplifications 
Signed-off-by: Lukasz Marek <lukasz.m.luki2@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2014-07-24 04:50:32 +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
*/
#include <float.h>
#include <stdint.h>
#include "libavutil/attributes.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 MovieStream {
AVStream *st;
int done;
} MovieStream;
typedef struct MovieContext {
/* 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;
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)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM
static const AVOption movie_options[]= {
{ "filename", NULL, OFFSET(file_name), AV_OPT_TYPE_STRING, .flags = FLAGS },
{ "format_name", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, .flags = FLAGS },
{ "f", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, .flags = FLAGS },
{ "stream_index", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
{ "si", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
{ "seek_point", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, 0, (INT64_MAX-1) / 1000000, FLAGS },
{ "sp", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, 0, (INT64_MAX-1) / 1000000, FLAGS },
{ "streams", "set streams", OFFSET(stream_specs), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MAX, CHAR_MAX, FLAGS },
{ "s", "set streams", OFFSET(stream_specs), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MAX, CHAR_MAX, FLAGS },
{ "loop", "set loop count", OFFSET(loop_count), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, FLAGS },
{ NULL },
};
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[2], dummy;
AVStream *found = NULL;
enum AVMediaType type;
ret = sscanf(spec, "d%1[av]%d%c", type_char, &stream_id, &dummy);
if (ret >= 1 && ret <= 2) {
type = type_char[0] == '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);
}
st->st->codec->refcounted_frames = 1;
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_common_init(AVFilterContext *ctx)
{
MovieContext *movie = ctx->priv;
AVInputFormat *iformat = NULL;
int64_t timestamp;
int nb_streams = 1, ret, i;
char default_streams[16], *stream_specs, *spec, *cursor;
char name[16];
AVStream *st;
if (!movie->file_name) {
av_log(ctx, AV_LOG_ERROR, "No filename provided!\n");
return AVERROR(EINVAL);
}
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; *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++) {
AVFilterPad pad = { 0 };
movie->out_index[movie->st[i].st->index] = i;
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;
}
}
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_freep(&movie->st);
av_freep(&movie->out_index);
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 char *describe_frame_to_str(char *dst, size_t dst_size,
AVFrame *frame, enum AVMediaType frame_type,
AVFilterLink *link)
{
switch (frame_type) {
case AVMEDIA_TYPE_VIDEO:
snprintf(dst, dst_size,
"video pts:%s time:%s size:%dx%d aspect:%d/%d",
av_ts2str(frame->pts), av_ts2timestr(frame->pts, &link->time_base),
frame->width, frame->height,
frame->sample_aspect_ratio.num,
frame->sample_aspect_ratio.den);
break;
case AVMEDIA_TYPE_AUDIO:
snprintf(dst, dst_size,
"audio pts:%s time:%s samples:%d",
av_ts2str(frame->pts), av_ts2timestr(frame->pts, &link->time_base),
frame->nb_samples);
break;
default:
snprintf(dst, dst_size, "%s BUG", av_get_media_type_string(frame_type));
break;
}
return dst;
}
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.
*
* @param ctx filter context
* @param out_id number of output where a frame is wanted;
* if the frame is read from file, used to set the return value;
* if the codec is being flushed, flush the corresponding stream
* @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;
enum AVMediaType frame_type;
MovieStream *st;
int ret, got_frame = 0, pkt_out_id;
AVFilterLink *outlink;
AVFrame *frame;
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;
}
pkt->stream_index = movie->st[out_id].st->index;
/* 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];
frame = av_frame_alloc();
if (!frame)
return AVERROR(ENOMEM);
frame_type = st->st->codec->codec_type;
switch (frame_type) {
case AVMEDIA_TYPE_VIDEO:
ret = avcodec_decode_video2(st->st->codec, frame, &got_frame, pkt);
break;
case AVMEDIA_TYPE_AUDIO:
ret = avcodec_decode_audio4(st->st->codec, 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));
av_frame_free(&frame);
av_free_packet(&movie->pkt0);
movie->pkt.size = 0;
movie->pkt.data = NULL;
return 0;
}
if (!ret || st->st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
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;
av_frame_free(&frame);
return 0;
}
frame->pts = av_frame_get_best_effort_timestamp(frame);
av_dlog(ctx, "movie_push_frame(): file:'%s' %s\n", movie->file_name,
describe_frame_to_str((char[1024]){0}, 1024, frame, frame_type, outlink));
if (st->st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
if (frame->format != outlink->format) {
av_log(ctx, AV_LOG_ERROR, "Format changed %s -> %s, discarding frame\n",
av_get_pix_fmt_name(outlink->format),
av_get_pix_fmt_name(frame->format)
);
av_frame_free(&frame);
return 0;
}
}
ret = ff_filter_frame(outlink, frame);
if (ret < 0)
return ret;
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_DEFINE_CLASS(movie);
AVFilter ff_avsrc_movie = {
.name = "movie",
.description = NULL_IF_CONFIG_SMALL("Read from a movie source."),
.priv_size = sizeof(MovieContext),
.priv_class = &movie_class,
.init = movie_common_init,
.uninit = movie_uninit,
.query_formats = movie_query_formats,
.inputs = NULL,
.outputs = NULL,
.flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
};
#endif /* CONFIG_MOVIE_FILTER */
#if CONFIG_AMOVIE_FILTER
#define amovie_options movie_options
AVFILTER_DEFINE_CLASS(amovie);
AVFilter ff_avsrc_amovie = {
.name = "amovie",
.description = NULL_IF_CONFIG_SMALL("Read audio from a movie source."),
.priv_size = sizeof(MovieContext),
.init = movie_common_init,
.uninit = movie_uninit,
.query_formats = movie_query_formats,
.inputs = NULL,
.outputs = NULL,
.priv_class = &amovie_class,
.flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
};
#endif /* CONFIG_AMOVIE_FILTER */
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