#include <libavutil/imgutils.h>
#include <libavutil/mem.h>
#include <libavutil/pixfmt.h>
+#include <libavutil/opt.h>
#include <libswscale/swscale.h>
}
if (has_dequeue_callbacks) {
dequeue_cleanup_callback();
}
+ avresample_free(&resampler);
}
void FFmpegCapture::configure_card()
int audio_stream_index = find_stream_index(format_ctx.get(), AVMEDIA_TYPE_AUDIO);
- const AVCodecParameters *codecpar = format_ctx->streams[video_stream_index]->codecpar;
+ // Open video decoder.
+ const AVCodecParameters *video_codecpar = format_ctx->streams[video_stream_index]->codecpar;
+ AVCodec *video_codec = avcodec_find_decoder(video_codecpar->codec_id);
video_timebase = format_ctx->streams[video_stream_index]->time_base;
- AVCodecContextWithDeleter codec_ctx = avcodec_alloc_context3_unique(nullptr);
- if (avcodec_parameters_to_context(codec_ctx.get(), codecpar) < 0) {
- fprintf(stderr, "%s: Cannot fill codec parameters\n", pathname.c_str());
+ AVCodecContextWithDeleter video_codec_ctx = avcodec_alloc_context3_unique(nullptr);
+ if (avcodec_parameters_to_context(video_codec_ctx.get(), video_codecpar) < 0) {
+ fprintf(stderr, "%s: Cannot fill video codec parameters\n", pathname.c_str());
return false;
}
- AVCodec *codec = avcodec_find_decoder(codecpar->codec_id);
- if (codec == nullptr) {
- fprintf(stderr, "%s: Cannot find decoder\n", pathname.c_str());
+ if (video_codec == nullptr) {
+ fprintf(stderr, "%s: Cannot find video decoder\n", pathname.c_str());
return false;
}
- if (avcodec_open2(codec_ctx.get(), codec, nullptr) < 0) {
- fprintf(stderr, "%s: Cannot open decoder\n", pathname.c_str());
+ if (avcodec_open2(video_codec_ctx.get(), video_codec, nullptr) < 0) {
+ fprintf(stderr, "%s: Cannot open video decoder\n", pathname.c_str());
return false;
}
- unique_ptr<AVCodecContext, decltype(avcodec_close)*> codec_ctx_cleanup(
- codec_ctx.get(), avcodec_close);
+ unique_ptr<AVCodecContext, decltype(avcodec_close)*> video_codec_ctx_cleanup(
+ video_codec_ctx.get(), avcodec_close);
+
+ // Open audio decoder, if we have audio.
+ AVCodecContextWithDeleter audio_codec_ctx = avcodec_alloc_context3_unique(nullptr);
+ if (audio_stream_index != -1) {
+ const AVCodecParameters *audio_codecpar = format_ctx->streams[audio_stream_index]->codecpar;
+ audio_timebase = format_ctx->streams[audio_stream_index]->time_base;
+ if (avcodec_parameters_to_context(audio_codec_ctx.get(), audio_codecpar) < 0) {
+ fprintf(stderr, "%s: Cannot fill audio codec parameters\n", pathname.c_str());
+ return false;
+ }
+ AVCodec *audio_codec = avcodec_find_decoder(audio_codecpar->codec_id);
+ if (audio_codec == nullptr) {
+ fprintf(stderr, "%s: Cannot find audio decoder\n", pathname.c_str());
+ return false;
+ }
+ if (avcodec_open2(audio_codec_ctx.get(), audio_codec, nullptr) < 0) {
+ fprintf(stderr, "%s: Cannot open audio decoder\n", pathname.c_str());
+ return false;
+ }
+ }
+ unique_ptr<AVCodecContext, decltype(avcodec_close)*> audio_codec_ctx_cleanup(
+ audio_codec_ctx.get(), avcodec_close);
internal_rewind();
if (process_queued_commands(format_ctx.get(), pathname, last_modified, /*rewound=*/nullptr)) {
return true;
}
+ FrameAllocator::Frame audio_frame = audio_frame_allocator->alloc_frame();
+ AudioFormat audio_format;
bool error;
- AVFrameWithDeleter frame = decode_frame(format_ctx.get(), codec_ctx.get(), pathname, video_stream_index, audio_stream_index, &error);
+ AVFrameWithDeleter frame = decode_frame(format_ctx.get(), video_codec_ctx.get(), audio_codec_ctx.get(),
+ pathname, video_stream_index, audio_stream_index, &audio_frame, &audio_format, &error);
if (error) {
return false;
}
return false;
}
- FrameAllocator::Frame audio_frame;
- AudioFormat audio_format;
- audio_format.bits_per_sample = 32;
- audio_format.num_channels = 8;
-
for ( ;; ) {
if (last_pts == 0 && pts_origin == 0) {
pts_origin = frame->pts;
return false;
}
-AVFrameWithDeleter FFmpegCapture::decode_frame(AVFormatContext *format_ctx, AVCodecContext *codec_ctx, const std::string &pathname, int video_stream_index, int audio_stream_index, bool *error)
+namespace {
+
+} // namespace
+
+AVFrameWithDeleter FFmpegCapture::decode_frame(AVFormatContext *format_ctx, AVCodecContext *video_codec_ctx, AVCodecContext *audio_codec_ctx, const std::string &pathname, int video_stream_index, int audio_stream_index, FrameAllocator::Frame *audio_frame, AudioFormat *audio_format, bool *error)
{
*error = false;
// Read packets until we have a frame or there are none left.
bool frame_finished = false;
- AVFrameWithDeleter frame = av_frame_alloc_unique();
+ AVFrameWithDeleter audio_avframe = av_frame_alloc_unique();
+ AVFrameWithDeleter video_avframe = av_frame_alloc_unique();
bool eof = false;
do {
AVPacket pkt;
if (pkt.stream_index == audio_stream_index && audio_callback != nullptr) {
audio_callback(&pkt, format_ctx->streams[audio_stream_index]->time_base);
}
- if (pkt.stream_index != video_stream_index) {
- // Ignore audio for now.
- continue;
- }
- if (avcodec_send_packet(codec_ctx, &pkt) < 0) {
- fprintf(stderr, "%s: Cannot send packet to codec.\n", pathname.c_str());
- *error = true;
- return AVFrameWithDeleter(nullptr);
+ if (pkt.stream_index == video_stream_index) {
+ if (avcodec_send_packet(video_codec_ctx, &pkt) < 0) {
+ fprintf(stderr, "%s: Cannot send packet to video codec.\n", pathname.c_str());
+ *error = true;
+ return AVFrameWithDeleter(nullptr);
+ }
+ } else if (pkt.stream_index == audio_stream_index) {
+ if (avcodec_send_packet(audio_codec_ctx, &pkt) < 0) {
+ fprintf(stderr, "%s: Cannot send packet to audio codec.\n", pathname.c_str());
+ *error = true;
+ return AVFrameWithDeleter(nullptr);
+ }
}
} else {
eof = true; // Or error, but ignore that for the time being.
}
- int err = avcodec_receive_frame(codec_ctx, frame.get());
+ // Decode audio, if any.
+ int err = avcodec_receive_frame(audio_codec_ctx, audio_avframe.get());
+ if (err == 0) {
+ convert_audio(audio_avframe.get(), audio_frame, audio_format);
+ } else if (err != AVERROR(EAGAIN)) {
+ fprintf(stderr, "%s: Cannot receive frame from audio codec.\n", pathname.c_str());
+ *error = true;
+ return AVFrameWithDeleter(nullptr);
+ }
+
+ // Decode video, if we have a frame.
+ err = avcodec_receive_frame(video_codec_ctx, video_avframe.get());
if (err == 0) {
frame_finished = true;
break;
} else if (err != AVERROR(EAGAIN)) {
- fprintf(stderr, "%s: Cannot receive frame from codec.\n", pathname.c_str());
+ fprintf(stderr, "%s: Cannot receive frame from video codec.\n", pathname.c_str());
*error = true;
return AVFrameWithDeleter(nullptr);
}
} while (!eof);
if (frame_finished)
- return frame;
+ return video_avframe;
else
return AVFrameWithDeleter(nullptr);
}
+void FFmpegCapture::convert_audio(const AVFrame *audio_avframe, FrameAllocator::Frame *audio_frame, AudioFormat *audio_format)
+{
+ // Decide on a format. If there already is one in this audio frame,
+ // we're pretty much forced to use it. If not, we try to find an exact match.
+ // If that still doesn't work, we default to 32-bit signed chunked
+ // (float would be nice, but there's really no way to signal that yet).
+ AVSampleFormat dst_format;
+ if (audio_format->bits_per_sample == 0) {
+ switch (audio_avframe->format) {
+ case AV_SAMPLE_FMT_S16:
+ case AV_SAMPLE_FMT_S16P:
+ audio_format->bits_per_sample = 16;
+ dst_format = AV_SAMPLE_FMT_S16;
+ break;
+ case AV_SAMPLE_FMT_S32:
+ case AV_SAMPLE_FMT_S32P:
+ default:
+ audio_format->bits_per_sample = 32;
+ dst_format = AV_SAMPLE_FMT_S32;
+ break;
+ }
+ } else if (audio_format->bits_per_sample == 16) {
+ dst_format = AV_SAMPLE_FMT_S16;
+ } else if (audio_format->bits_per_sample == 32) {
+ dst_format = AV_SAMPLE_FMT_S32;
+ } else {
+ assert(false);
+ }
+ audio_format->num_channels = 2;
+
+ if (resampler == nullptr ||
+ audio_avframe->format != last_src_format ||
+ dst_format != last_dst_format ||
+ av_frame_get_channel_layout(audio_avframe) != last_channel_layout ||
+ av_frame_get_sample_rate(audio_avframe) != last_sample_rate) {
+ avresample_free(&resampler);
+ resampler = avresample_alloc_context();
+ if (resampler == nullptr) {
+ fprintf(stderr, "Allocating resampler failed.\n");
+ exit(1);
+ }
+
+ av_opt_set_int(resampler, "in_channel_layout", av_frame_get_channel_layout(audio_avframe), 0);
+ av_opt_set_int(resampler, "out_channel_layout", AV_CH_LAYOUT_STEREO, 0);
+ av_opt_set_int(resampler, "in_sample_rate", av_frame_get_sample_rate(audio_avframe), 0);
+ av_opt_set_int(resampler, "out_sample_rate", OUTPUT_FREQUENCY, 0);
+ av_opt_set_int(resampler, "in_sample_fmt", audio_avframe->format, 0);
+ av_opt_set_int(resampler, "out_sample_fmt", dst_format, 0);
+
+ if (avresample_open(resampler) < 0) {
+ fprintf(stderr, "Could not open resample context.\n");
+ exit(1);
+ }
+
+ last_src_format = AVSampleFormat(audio_avframe->format);
+ last_dst_format = dst_format;
+ last_channel_layout = av_frame_get_channel_layout(audio_avframe);
+ last_sample_rate = av_frame_get_sample_rate(audio_avframe);
+ }
+
+ size_t bytes_per_sample = (audio_format->bits_per_sample / 8) * 2;
+ size_t num_samples_room = (audio_frame->size - audio_frame->len) / bytes_per_sample;
+
+ uint8_t *data = audio_frame->data + audio_frame->len;
+ int out_samples = avresample_convert(resampler, &data, 0, num_samples_room,
+ audio_avframe->data, audio_avframe->linesize[0], audio_avframe->nb_samples);
+ if (out_samples < 0) {
+ fprintf(stderr, "Audio conversion failed.\n");
+ exit(1);
+ }
+
+ audio_frame->len += out_samples * bytes_per_sample;
+}
+
VideoFormat FFmpegCapture::construct_video_format(const AVFrame *frame, AVRational video_timebase)
{
VideoFormat video_format;
// but it would require some more plumbing, and it would also fail if the file
// changes parameters midway, which is allowed in some formats.
//
-// There is currently no audio support.
+// You can get out the audio either as decoded or in raw form (Kaeru uses this).
+// However, the rest of Nageru can't really use the audio for anything yet.
#include <assert.h>
#include <stdint.h>
#include <movit/ycbcr.h>
extern "C" {
+#include <libavresample/avresample.h>
#include <libavutil/pixfmt.h>
#include <libavutil/rational.h>
}
bool process_queued_commands(AVFormatContext *format_ctx, const std::string &pathname, timespec last_modified, bool *rewound);
// Returns nullptr if no frame was decoded (e.g. EOF).
- AVFrameWithDeleter decode_frame(AVFormatContext *format_ctx, AVCodecContext *codec_ctx, const std::string &pathname, int video_stream_index, int audio_stream_index, bool *error);
+ AVFrameWithDeleter decode_frame(AVFormatContext *format_ctx, AVCodecContext *video_codec_ctx, AVCodecContext *audio_codec_ctx,
+ const std::string &pathname, int video_stream_index, int audio_stream_index,
+ bmusb::FrameAllocator::Frame *audio_frame, bmusb::AudioFormat *audio_format, bool *error);
+ void convert_audio(const AVFrame *audio_avframe, bmusb::FrameAllocator::Frame *audio_frame, bmusb::AudioFormat *audio_format);
bmusb::VideoFormat construct_video_format(const AVFrame *frame, AVRational video_timebase);
bmusb::FrameAllocator::Frame make_video_frame(const AVFrame *frame, const std::string &pathname, bool *error);
SwsContextWithDeleter sws_ctx;
int sws_last_width = -1, sws_last_height = -1, sws_last_src_format = -1;
AVPixelFormat sws_dst_format = AVPixelFormat(-1); // In practice, always initialized.
- AVRational video_timebase;
+ AVRational video_timebase, audio_timebase;
QuittableSleeper producer_thread_should_quit;
std::thread producer_thread;
double new_rate; // For CHANGE_RATE.
};
std::vector<QueuedCommand> command_queue; // Protected by <queue_mu>.
+
+ // Audio resampler.
+ AVAudioResampleContext *resampler = nullptr;
+ AVSampleFormat last_src_format, last_dst_format;
+ int64_t last_channel_layout;
+ int last_sample_rate;
+
};
#endif // !defined(_FFMPEG_CAPTURE_H)
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