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843b282cc4c4ae4ad3dadcf98916c8c5649f7fbf
OpenMaidEngine/native/age_movie_ffmpeg/age_movie.c
gamer147 843b282cc4 Add synchronized MPEG movie audio
2026-07-25 11:49:50 -04:00

741 lines
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#include "age_movie.h"
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libavutil/avutil.h>
#include <libavutil/error.h>
#include <libavutil/imgutils.h>
#include <libavutil/mathematics.h>
#include <libavutil/channel_layout.h>
#include <libswresample/swresample.h>
#include <libswscale/swscale.h>
#define AGE_MOVIE_ABI_VERSION 2u
#define AGE_MOVIE_IO_BUFFER_SIZE 32768
#define AGE_MOVIE_ERROR_SIZE 512
typedef struct age_movie_io_state {
const uint8_t *payload;
size_t payload_size;
size_t position;
} age_movie_io_state;
struct age_movie {
uint8_t *payload;
size_t payload_size;
age_movie_io_state video_io_state;
AVIOContext *video_io;
AVFormatContext *video_format;
AVCodecContext *video_codec;
AVPacket *video_packet;
AVFrame *video_frame;
AVFrame *rgba_frame;
struct SwsContext *sws;
int video_stream_index;
AVRational video_time_base;
int video_input_eof;
int video_decoder_draining;
int video_decoder_eof;
int64_t decoded_video_frame_count;
age_movie_io_state audio_io_state;
AVIOContext *audio_io;
AVFormatContext *audio_format;
AVCodecContext *audio_codec;
AVPacket *audio_packet;
AVFrame *audio_frame;
SwrContext *swr;
int audio_stream_index;
AVRational audio_time_base;
int audio_input_eof;
int audio_decoder_draining;
int audio_decoder_eof;
int audio_frame_pending;
int64_t decoded_audio_sample_count;
int audio_sample_rate;
int64_t timeline_origin_ms;
int width;
int height;
char error[AGE_MOVIE_ERROR_SIZE];
};
static void copy_error(char *destination, size_t destination_size, const char *message) {
if (destination == NULL || destination_size == 0) {
return;
}
snprintf(destination, destination_size, "%s", message != NULL ? message : "unknown FFmpeg error");
}
static void set_error(age_movie *movie, const char *operation, int ffmpeg_error) {
char detail[AV_ERROR_MAX_STRING_SIZE] = {0};
if (av_strerror(ffmpeg_error, detail, sizeof(detail)) < 0) {
snprintf(detail, sizeof(detail), "FFmpeg error %d", ffmpeg_error);
}
snprintf(movie->error, sizeof(movie->error), "%s: %s", operation, detail);
}
static int read_packet(void *opaque, uint8_t *buffer, int buffer_size) {
age_movie_io_state *state = (age_movie_io_state *)opaque;
if (state == NULL || buffer == NULL || buffer_size <= 0) {
return AVERROR(EINVAL);
}
if (state->position >= state->payload_size) {
return AVERROR_EOF;
}
size_t remaining = state->payload_size - state->position;
size_t requested = (size_t)buffer_size;
size_t count = remaining < requested ? remaining : requested;
memcpy(buffer, state->payload + state->position, count);
state->position += count;
return (int)count;
}
static int64_t seek_payload(void *opaque, int64_t offset, int whence) {
age_movie_io_state *state = (age_movie_io_state *)opaque;
if (state == NULL) {
return AVERROR(EINVAL);
}
if ((whence & AVSEEK_SIZE) != 0) {
return state->payload_size <= INT64_MAX ? (int64_t)state->payload_size : AVERROR(EOVERFLOW);
}
int base_whence = whence & ~AVSEEK_FORCE;
int64_t base;
switch (base_whence) {
case SEEK_SET: base = 0; break;
case SEEK_CUR:
if (state->position > INT64_MAX) return AVERROR(EOVERFLOW);
base = (int64_t)state->position;
break;
case SEEK_END:
if (state->payload_size > INT64_MAX) return AVERROR(EOVERFLOW);
base = (int64_t)state->payload_size;
break;
default: return AVERROR(EINVAL);
}
if (offset == INT64_MIN || (offset > 0 && base > INT64_MAX - offset) ||
(offset < 0 && base < -offset)) {
return AVERROR(EOVERFLOW);
}
int64_t target = base + offset;
if (target < 0 || (uint64_t)target > state->payload_size) {
return AVERROR(EINVAL);
}
state->position = (size_t)target;
return target;
}
static int64_t rescale_ms_down(int64_t value, AVRational time_base) {
return av_rescale_q_rnd(value, time_base, (AVRational){1, 1000},
AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
}
static int open_format_context(age_movie *movie, age_movie_io_state *state,
AVIOContext **out_io, AVFormatContext **out_format) {
state->payload = movie->payload;
state->payload_size = movie->payload_size;
state->position = 0;
uint8_t *io_buffer = (uint8_t *)av_malloc(AGE_MOVIE_IO_BUFFER_SIZE);
if (io_buffer == NULL) return AVERROR(ENOMEM);
AVIOContext *io = avio_alloc_context(io_buffer, AGE_MOVIE_IO_BUFFER_SIZE, 0,
state, read_packet, NULL, seek_payload);
if (io == NULL) {
av_free(io_buffer);
return AVERROR(ENOMEM);
}
AVFormatContext *format = avformat_alloc_context();
if (format == NULL) {
av_freep(&io->buffer);
avio_context_free(&io);
return AVERROR(ENOMEM);
}
format->pb = io;
format->flags |= AVFMT_FLAG_CUSTOM_IO;
int result = avformat_open_input(&format, NULL, NULL, NULL);
if (result >= 0) result = avformat_find_stream_info(format, NULL);
if (result < 0) {
avformat_close_input(&format);
av_freep(&io->buffer);
avio_context_free(&io);
return result;
}
*out_io = io;
*out_format = format;
return 0;
}
static int64_t determine_timeline_origin_ms(const AVFormatContext *format) {
int64_t origin_ms = INT64_MAX;
for (unsigned int index = 0; index < format->nb_streams; index++) {
const AVStream *stream = format->streams[index];
enum AVMediaType type = stream->codecpar->codec_type;
if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) continue;
if (stream->start_time == AV_NOPTS_VALUE) continue;
int64_t candidate = rescale_ms_down(stream->start_time, stream->time_base);
if (candidate < origin_ms) origin_ms = candidate;
}
if (origin_ms == INT64_MAX && format->start_time != AV_NOPTS_VALUE)
origin_ms = av_rescale_q_rnd(format->start_time,
(AVRational){1, AV_TIME_BASE}, (AVRational){1, 1000},
AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
return origin_ms == INT64_MAX ? 0 : origin_ms;
}
static int determine_duration(age_movie *movie, AVStream *stream, int64_t *out_duration_ms) {
int64_t best_duration_ms = 0;
if (stream->duration != AV_NOPTS_VALUE && stream->duration > 0) {
int64_t candidate = rescale_ms_down(stream->duration, stream->time_base);
if (candidate > best_duration_ms) best_duration_ms = candidate;
}
if (movie->video_format->duration != AV_NOPTS_VALUE && movie->video_format->duration > 0) {
int64_t candidate = av_rescale_q_rnd(movie->video_format->duration,
(AVRational){1, AV_TIME_BASE}, (AVRational){1, 1000},
AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
if (candidate > best_duration_ms) best_duration_ms = candidate;
}
int64_t first = AV_NOPTS_VALUE;
int64_t end = AV_NOPTS_VALUE;
int64_t video_packet_count = 0;
AVPacket *probe = av_packet_alloc();
if (probe == NULL) return AVERROR(ENOMEM);
int result;
int64_t media_end_ms = 0;
while ((result = av_read_frame(movie->video_format, probe)) >= 0) {
AVStream *packet_stream = movie->video_format->streams[probe->stream_index];
enum AVMediaType packet_type = packet_stream->codecpar->codec_type;
if ((packet_type == AVMEDIA_TYPE_VIDEO || packet_type == AVMEDIA_TYPE_AUDIO)
&& probe->pts != AV_NOPTS_VALUE) {
int64_t packet_end = probe->pts;
if (probe->duration > 0 && packet_end <= INT64_MAX - probe->duration)
packet_end += probe->duration;
int64_t candidate = rescale_ms_down(packet_end, packet_stream->time_base)
- movie->timeline_origin_ms;
if (candidate > media_end_ms) media_end_ms = candidate;
}
if (probe->stream_index == movie->video_stream_index) {
video_packet_count++;
int64_t timestamp = probe->pts != AV_NOPTS_VALUE ? probe->pts : probe->dts;
if (timestamp != AV_NOPTS_VALUE) {
if (first == AV_NOPTS_VALUE || timestamp < first) first = timestamp;
int64_t packet_end = timestamp;
if (probe->duration > 0 && timestamp <= INT64_MAX - probe->duration) {
packet_end += probe->duration;
}
if (end == AV_NOPTS_VALUE || packet_end > end) end = packet_end;
}
}
av_packet_unref(probe);
}
av_packet_free(&probe);
if (result != AVERROR_EOF) return result;
if (media_end_ms > best_duration_ms) best_duration_ms = media_end_ms;
if (first != AV_NOPTS_VALUE && end != AV_NOPTS_VALUE && end > first) {
int64_t candidate = rescale_ms_down(end - first, stream->time_base);
if (candidate > best_duration_ms) best_duration_ms = candidate;
}
AVRational average_rate = stream->avg_frame_rate;
if (video_packet_count > 0 && average_rate.num > 0 && average_rate.den > 0) {
int64_t candidate = av_rescale_q_rnd(video_packet_count, av_inv_q(average_rate),
(AVRational){1, 1000}, AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
if (candidate > best_duration_ms) best_duration_ms = candidate;
}
*out_duration_ms = best_duration_ms;
return best_duration_ms > 0 ? 0 : AVERROR_INVALIDDATA;
}
static int rewind_for_decode(age_movie *movie, AVStream *stream) {
int64_t target = stream->start_time != AV_NOPTS_VALUE ? stream->start_time : 0;
int result = av_seek_frame(movie->video_format, movie->video_stream_index, target, AVSEEK_FLAG_BACKWARD);
if (result < 0) {
movie->video_io_state.position = 0;
if (movie->video_io != NULL) {
avio_flush(movie->video_io);
movie->video_io->eof_reached = 0;
movie->video_io->error = 0;
}
result = avformat_seek_file(movie->video_format, movie->video_stream_index,
INT64_MIN, target, INT64_MAX, 0);
}
if (result >= 0) avcodec_flush_buffers(movie->video_codec);
return result;
}
static int rewind_audio_for_decode(age_movie *movie, AVStream *stream) {
int64_t target = stream->start_time != AV_NOPTS_VALUE ? stream->start_time : 0;
int result = av_seek_frame(movie->audio_format, movie->audio_stream_index, target, AVSEEK_FLAG_BACKWARD);
if (result < 0) {
movie->audio_io_state.position = 0;
if (movie->audio_io != NULL) {
avio_flush(movie->audio_io);
movie->audio_io->eof_reached = 0;
movie->audio_io->error = 0;
}
result = avformat_seek_file(movie->audio_format, movie->audio_stream_index,
INT64_MIN, target, INT64_MAX, 0);
}
if (result >= 0) avcodec_flush_buffers(movie->audio_codec);
return result;
}
static void destroy_movie(age_movie *movie) {
if (movie == NULL) return;
swr_free(&movie->swr);
sws_freeContext(movie->sws);
av_frame_free(&movie->audio_frame);
av_frame_free(&movie->rgba_frame);
av_frame_free(&movie->video_frame);
av_packet_free(&movie->audio_packet);
av_packet_free(&movie->video_packet);
avcodec_free_context(&movie->audio_codec);
avcodec_free_context(&movie->video_codec);
avformat_close_input(&movie->audio_format);
avformat_close_input(&movie->video_format);
if (movie->audio_io != NULL) {
av_freep(&movie->audio_io->buffer);
avio_context_free(&movie->audio_io);
}
if (movie->video_io != NULL) {
av_freep(&movie->video_io->buffer);
avio_context_free(&movie->video_io);
}
av_free(movie->payload);
free(movie);
}
uint32_t AGE_MOVIE_CALL age_movie_abi_version(void) {
return AGE_MOVIE_ABI_VERSION;
}
int32_t AGE_MOVIE_CALL age_movie_open(const uint8_t *bytes, size_t length,
age_movie **out_movie, age_movie_info *out_info,
char *error_buffer, size_t error_buffer_size) {
if (out_movie != NULL) *out_movie = NULL;
if (out_info != NULL) memset(out_info, 0, sizeof(*out_info));
if (bytes == NULL || length == 0 || out_movie == NULL || out_info == NULL) {
copy_error(error_buffer, error_buffer_size, "invalid movie open arguments");
return AGE_MOVIE_INVALID_ARGUMENT;
}
age_movie *movie = (age_movie *)calloc(1, sizeof(*movie));
if (movie == NULL) {
copy_error(error_buffer, error_buffer_size, "movie allocation failed");
return AGE_MOVIE_ERROR;
}
movie->video_stream_index = -1;
movie->audio_stream_index = -1;
if (length > SIZE_MAX - AV_INPUT_BUFFER_PADDING_SIZE) {
snprintf(movie->error, sizeof(movie->error), "movie payload is too large");
goto failure;
}
movie->payload = (uint8_t *)av_mallocz(length + AV_INPUT_BUFFER_PADDING_SIZE);
if (movie->payload == NULL) {
snprintf(movie->error, sizeof(movie->error), "movie payload allocation failed");
goto failure;
}
memcpy(movie->payload, bytes, length);
movie->payload_size = length;
int result = open_format_context(movie, &movie->video_io_state,
&movie->video_io, &movie->video_format);
if (result < 0) {
set_error(movie, "open MPEG program stream", result);
goto failure;
}
movie->timeline_origin_ms = determine_timeline_origin_ms(movie->video_format);
const AVCodec *video_decoder = NULL;
result = av_find_best_stream(movie->video_format, AVMEDIA_TYPE_VIDEO, -1, -1, &video_decoder, 0);
if (result < 0 || video_decoder == NULL) {
set_error(movie, "find MPEG video stream", result < 0 ? result : AVERROR_DECODER_NOT_FOUND);
goto failure;
}
movie->video_stream_index = result;
AVStream *stream = movie->video_format->streams[movie->video_stream_index];
movie->video_time_base = stream->time_base;
movie->video_codec = avcodec_alloc_context3(video_decoder);
if (movie->video_codec == NULL) {
snprintf(movie->error, sizeof(movie->error), "video decoder allocation failed");
goto failure;
}
result = avcodec_parameters_to_context(movie->video_codec, stream->codecpar);
if (result < 0) {
set_error(movie, "copy video parameters", result);
goto failure;
}
result = avcodec_open2(movie->video_codec, video_decoder, NULL);
if (result < 0) {
set_error(movie, "open MPEG-1 video decoder", result);
goto failure;
}
movie->width = movie->video_codec->width;
movie->height = movie->video_codec->height;
if (movie->width <= 0 || movie->height <= 0) {
snprintf(movie->error, sizeof(movie->error), "invalid video dimensions %dx%d", movie->width, movie->height);
goto failure;
}
if ((size_t)movie->width > SIZE_MAX / 4u / (size_t)movie->height) {
snprintf(movie->error, sizeof(movie->error), "video dimensions overflow RGBA storage");
goto failure;
}
int64_t duration_ms = 0;
result = rewind_for_decode(movie, stream);
if (result < 0) {
set_error(movie, "rewind MPEG stream for duration scan", result);
goto failure;
}
result = determine_duration(movie, stream, &duration_ms);
if (result < 0) {
set_error(movie, "determine video duration", result);
goto failure;
}
result = rewind_for_decode(movie, stream);
if (result < 0) {
set_error(movie, "rewind MPEG stream", result);
goto failure;
}
movie->video_packet = av_packet_alloc();
movie->video_frame = av_frame_alloc();
movie->rgba_frame = av_frame_alloc();
if (movie->video_packet == NULL || movie->video_frame == NULL || movie->rgba_frame == NULL) {
snprintf(movie->error, sizeof(movie->error), "video packet/frame allocation failed");
goto failure;
}
movie->rgba_frame->format = AV_PIX_FMT_RGBA;
movie->rgba_frame->width = movie->width;
movie->rgba_frame->height = movie->height;
result = av_frame_get_buffer(movie->rgba_frame, 32);
if (result < 0) {
set_error(movie, "allocate aligned RGBA frame", result);
goto failure;
}
const AVCodec *audio_decoder = NULL;
result = av_find_best_stream(movie->video_format, AVMEDIA_TYPE_AUDIO, -1, -1, &audio_decoder, 0);
if (result >= 0 && audio_decoder != NULL) {
result = open_format_context(movie, &movie->audio_io_state,
&movie->audio_io, &movie->audio_format);
if (result < 0) {
set_error(movie, "open MPEG audio program stream", result);
goto failure;
}
result = av_find_best_stream(movie->audio_format, AVMEDIA_TYPE_AUDIO,
-1, -1, &audio_decoder, 0);
if (result < 0 || audio_decoder == NULL) {
set_error(movie, "find MPEG audio stream",
result < 0 ? result : AVERROR_DECODER_NOT_FOUND);
goto failure;
}
movie->audio_stream_index = result;
AVStream *audio_stream = movie->audio_format->streams[movie->audio_stream_index];
movie->audio_time_base = audio_stream->time_base;
movie->audio_codec = avcodec_alloc_context3(audio_decoder);
if (movie->audio_codec == NULL) {
snprintf(movie->error, sizeof(movie->error), "audio decoder allocation failed");
goto failure;
}
result = avcodec_parameters_to_context(movie->audio_codec, audio_stream->codecpar);
if (result < 0) {
set_error(movie, "copy audio parameters", result);
goto failure;
}
result = avcodec_open2(movie->audio_codec, audio_decoder, NULL);
if (result < 0) {
set_error(movie, "open MPEG audio decoder", result);
goto failure;
}
movie->audio_sample_rate = movie->audio_codec->sample_rate;
if (movie->audio_sample_rate <= 0) {
snprintf(movie->error, sizeof(movie->error), "invalid audio sample rate %d",
movie->audio_sample_rate);
goto failure;
}
AVChannelLayout stereo_layout = AV_CHANNEL_LAYOUT_STEREO;
result = swr_alloc_set_opts2(&movie->swr,
&stereo_layout, AV_SAMPLE_FMT_FLT, movie->audio_sample_rate,
&movie->audio_codec->ch_layout, movie->audio_codec->sample_fmt,
movie->audio_sample_rate, 0, NULL);
if (result < 0 || movie->swr == NULL) {
set_error(movie, "configure stereo PCM conversion",
result < 0 ? result : AVERROR(ENOMEM));
goto failure;
}
result = swr_init(movie->swr);
if (result < 0) {
set_error(movie, "initialize stereo PCM conversion", result);
goto failure;
}
result = rewind_audio_for_decode(movie, audio_stream);
if (result < 0) {
set_error(movie, "rewind MPEG audio stream", result);
goto failure;
}
movie->audio_packet = av_packet_alloc();
movie->audio_frame = av_frame_alloc();
if (movie->audio_packet == NULL || movie->audio_frame == NULL) {
snprintf(movie->error, sizeof(movie->error), "audio packet/frame allocation failed");
goto failure;
}
}
AVRational frame_rate = av_guess_frame_rate(movie->video_format, stream, NULL);
out_info->width = movie->width;
out_info->height = movie->height;
out_info->stop_time_ms = duration_ms;
out_info->frame_rate_num = frame_rate.num;
out_info->frame_rate_den = frame_rate.den;
if (movie->audio_stream_index >= 0) {
out_info->has_audio = 1;
out_info->audio_sample_rate = movie->audio_sample_rate;
out_info->audio_channels = 2;
out_info->audio_frame_samples = movie->audio_codec->frame_size > 0
? movie->audio_codec->frame_size : 4096;
}
*out_movie = movie;
copy_error(error_buffer, error_buffer_size, "");
return 0;
failure:
copy_error(error_buffer, error_buffer_size, movie->error);
destroy_movie(movie);
return AGE_MOVIE_ERROR;
}
int32_t AGE_MOVIE_CALL age_movie_decode_video(age_movie *movie,
uint8_t *rgba, size_t rgba_size, int64_t *out_pts_ms) {
if (movie == NULL || rgba == NULL || out_pts_ms == NULL) return AGE_MOVIE_INVALID_ARGUMENT;
size_t required = (size_t)movie->width * (size_t)movie->height * 4u;
if (rgba_size < required) return AGE_MOVIE_BUFFER_TOO_SMALL;
if (movie->video_decoder_eof) return AGE_MOVIE_EOF;
for (;;) {
int result = avcodec_receive_frame(movie->video_codec, movie->video_frame);
if (result == 0) {
movie->sws = sws_getCachedContext(movie->sws,
movie->video_frame->width, movie->video_frame->height,
(enum AVPixelFormat)movie->video_frame->format,
movie->width, movie->height, AV_PIX_FMT_RGBA,
SWS_BILINEAR, NULL, NULL, NULL);
if (movie->sws == NULL) {
snprintf(movie->error, sizeof(movie->error), "create RGBA conversion context failed");
return AGE_MOVIE_ERROR;
}
result = av_frame_make_writable(movie->rgba_frame);
if (result < 0) {
set_error(movie, "make aligned RGBA frame writable", result);
return AGE_MOVIE_ERROR;
}
result = sws_scale(movie->sws,
(const uint8_t * const *)movie->video_frame->data, movie->video_frame->linesize,
0, movie->video_frame->height, movie->rgba_frame->data, movie->rgba_frame->linesize);
if (result != movie->height) {
snprintf(movie->error, sizeof(movie->error), "RGBA conversion returned %d of %d rows", result, movie->height);
return AGE_MOVIE_ERROR;
}
size_t row_size = (size_t)movie->width * 4u;
for (int row = 0; row < movie->height; row++) {
memcpy(rgba + (size_t)row * row_size,
movie->rgba_frame->data[0] + (ptrdiff_t)row * movie->rgba_frame->linesize[0],
row_size);
}
int64_t timestamp = movie->video_frame->best_effort_timestamp;
if (timestamp == AV_NOPTS_VALUE) {
timestamp = movie->video_frame->pts;
}
if (timestamp == AV_NOPTS_VALUE) {
AVRational rate = av_guess_frame_rate(movie->video_format,
movie->video_format->streams[movie->video_stream_index], movie->video_frame);
if (rate.num <= 0 || rate.den <= 0) {
snprintf(movie->error, sizeof(movie->error), "decoded frame has no timestamp or frame rate");
return AGE_MOVIE_ERROR;
}
int64_t stream_start = movie->video_format->streams[movie->video_stream_index]->start_time;
int64_t start_ms = stream_start == AV_NOPTS_VALUE ? 0
: rescale_ms_down(stream_start, movie->video_time_base) - movie->timeline_origin_ms;
*out_pts_ms = start_ms + av_rescale_q_rnd(movie->decoded_video_frame_count, av_inv_q(rate),
(AVRational){1, 1000}, AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
} else {
*out_pts_ms = rescale_ms_down(timestamp, movie->video_time_base)
- movie->timeline_origin_ms;
}
if (*out_pts_ms < 0) *out_pts_ms = 0;
movie->decoded_video_frame_count++;
av_frame_unref(movie->video_frame);
return AGE_MOVIE_FRAME;
}
if (result == AVERROR_EOF) {
movie->video_decoder_eof = 1;
return AGE_MOVIE_EOF;
}
if (result != AVERROR(EAGAIN)) {
set_error(movie, "receive decoded video frame", result);
return AGE_MOVIE_ERROR;
}
if (movie->video_input_eof) {
if (!movie->video_decoder_draining) {
result = avcodec_send_packet(movie->video_codec, NULL);
if (result < 0 && result != AVERROR_EOF) {
set_error(movie, "flush MPEG-1 video decoder", result);
return AGE_MOVIE_ERROR;
}
movie->video_decoder_draining = 1;
continue;
}
snprintf(movie->error, sizeof(movie->error), "video decoder requested input after drain");
return AGE_MOVIE_ERROR;
}
for (;;) {
result = av_read_frame(movie->video_format, movie->video_packet);
if (result == AVERROR_EOF) {
movie->video_input_eof = 1;
break;
}
if (result < 0) {
set_error(movie, "read MPEG video packet", result);
return AGE_MOVIE_ERROR;
}
if (movie->video_packet->stream_index != movie->video_stream_index) {
av_packet_unref(movie->video_packet);
continue;
}
break;
}
if (movie->video_input_eof) continue;
result = avcodec_send_packet(movie->video_codec, movie->video_packet);
av_packet_unref(movie->video_packet);
if (result < 0) {
set_error(movie, "send MPEG video packet", result);
return AGE_MOVIE_ERROR;
}
}
}
int32_t AGE_MOVIE_CALL age_movie_decode_audio(age_movie *movie,
float *stereo, size_t frame_capacity, int32_t *out_frame_count, int64_t *out_pts_ms) {
if (out_frame_count != NULL) *out_frame_count = 0;
if (movie == NULL || out_frame_count == NULL || out_pts_ms == NULL)
return AGE_MOVIE_INVALID_ARGUMENT;
if (movie->audio_stream_index < 0) return AGE_MOVIE_EOF;
if (movie->audio_decoder_eof) return AGE_MOVIE_EOF;
for (;;) {
if (movie->audio_frame_pending) {
int required = swr_get_out_samples(movie->swr, movie->audio_frame->nb_samples);
if (required < 0) {
set_error(movie, "size stereo PCM conversion", required);
return AGE_MOVIE_ERROR;
}
*out_frame_count = required;
if (stereo == NULL || frame_capacity < (size_t)required)
return AGE_MOVIE_BUFFER_TOO_SMALL;
int64_t timestamp = movie->audio_frame->best_effort_timestamp;
if (timestamp == AV_NOPTS_VALUE) timestamp = movie->audio_frame->pts;
if (timestamp == AV_NOPTS_VALUE) {
AVStream *audio_stream = movie->audio_format->streams[movie->audio_stream_index];
int64_t stream_start = audio_stream->start_time;
int64_t start_ms = stream_start == AV_NOPTS_VALUE ? 0
: rescale_ms_down(stream_start, movie->audio_time_base)
- movie->timeline_origin_ms;
*out_pts_ms = start_ms + av_rescale_q_rnd(movie->decoded_audio_sample_count,
(AVRational){1, movie->audio_sample_rate}, (AVRational){1, 1000},
AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
} else {
*out_pts_ms = rescale_ms_down(timestamp, movie->audio_time_base)
- movie->timeline_origin_ms;
}
if (*out_pts_ms < 0) *out_pts_ms = 0;
uint8_t *output[1] = {(uint8_t *)stereo};
int converted = swr_convert(movie->swr, output, (int)frame_capacity,
(const uint8_t **)movie->audio_frame->extended_data,
movie->audio_frame->nb_samples);
if (converted < 0) {
set_error(movie, "convert MPEG audio to stereo PCM", converted);
return AGE_MOVIE_ERROR;
}
*out_frame_count = converted;
movie->decoded_audio_sample_count += converted;
movie->audio_frame_pending = 0;
av_frame_unref(movie->audio_frame);
return AGE_MOVIE_FRAME;
}
int result = avcodec_receive_frame(movie->audio_codec, movie->audio_frame);
if (result == 0) {
movie->audio_frame_pending = 1;
continue;
}
if (result == AVERROR_EOF) {
movie->audio_decoder_eof = 1;
return AGE_MOVIE_EOF;
}
if (result != AVERROR(EAGAIN)) {
set_error(movie, "receive decoded audio frame", result);
return AGE_MOVIE_ERROR;
}
if (movie->audio_input_eof) {
if (!movie->audio_decoder_draining) {
result = avcodec_send_packet(movie->audio_codec, NULL);
if (result < 0 && result != AVERROR_EOF) {
set_error(movie, "flush MPEG audio decoder", result);
return AGE_MOVIE_ERROR;
}
movie->audio_decoder_draining = 1;
continue;
}
snprintf(movie->error, sizeof(movie->error), "audio decoder requested input after drain");
return AGE_MOVIE_ERROR;
}
for (;;) {
result = av_read_frame(movie->audio_format, movie->audio_packet);
if (result == AVERROR_EOF) {
movie->audio_input_eof = 1;
break;
}
if (result < 0) {
set_error(movie, "read MPEG audio packet", result);
return AGE_MOVIE_ERROR;
}
if (movie->audio_packet->stream_index != movie->audio_stream_index) {
av_packet_unref(movie->audio_packet);
continue;
}
break;
}
if (movie->audio_input_eof) continue;
result = avcodec_send_packet(movie->audio_codec, movie->audio_packet);
av_packet_unref(movie->audio_packet);
if (result < 0) {
set_error(movie, "send MPEG audio packet", result);
return AGE_MOVIE_ERROR;
}
}
}
const char *AGE_MOVIE_CALL age_movie_last_error(const age_movie *movie) {
return movie != NULL ? movie->error : "movie handle is null";
}
void AGE_MOVIE_CALL age_movie_close(age_movie *movie) {
destroy_movie(movie);
}
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