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Diffstat (limited to '')
| -rw-r--r-- | src/decoder/plugins/FfmpegDecoderPlugin.cxx | 779 |
1 files changed, 779 insertions, 0 deletions
diff --git a/src/decoder/plugins/FfmpegDecoderPlugin.cxx b/src/decoder/plugins/FfmpegDecoderPlugin.cxx new file mode 100644 index 000000000..722f954e2 --- /dev/null +++ b/src/decoder/plugins/FfmpegDecoderPlugin.cxx @@ -0,0 +1,779 @@ +/* + * Copyright (C) 2003-2014 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +/* necessary because libavutil/common.h uses UINT64_C */ +#define __STDC_CONSTANT_MACROS + +#include "config.h" +#include "FfmpegDecoderPlugin.hxx" +#include "lib/ffmpeg/Domain.hxx" +#include "../DecoderAPI.hxx" +#include "FfmpegMetaData.hxx" +#include "tag/TagHandler.hxx" +#include "input/InputStream.hxx" +#include "CheckAudioFormat.hxx" +#include "util/Error.hxx" +#include "util/Domain.hxx" +#include "LogV.hxx" + +extern "C" { +#include <libavcodec/avcodec.h> +#include <libavformat/avformat.h> +#include <libavformat/avio.h> +#include <libavutil/avutil.h> +#include <libavutil/log.h> +#include <libavutil/mathematics.h> + +#if LIBAVUTIL_VERSION_MAJOR >= 53 +#include <libavutil/frame.h> +#endif +} + +#include <assert.h> +#include <string.h> + +/* suppress the ffmpeg compatibility macro */ +#ifdef SampleFormat +#undef SampleFormat +#endif + +static LogLevel +import_ffmpeg_level(int level) +{ + if (level <= AV_LOG_FATAL) + return LogLevel::ERROR; + + if (level <= AV_LOG_WARNING) + return LogLevel::WARNING; + + if (level <= AV_LOG_INFO) + return LogLevel::INFO; + + return LogLevel::DEBUG; +} + +static void +mpd_ffmpeg_log_callback(gcc_unused void *ptr, int level, + const char *fmt, va_list vl) +{ + const AVClass * cls = nullptr; + + if (ptr != nullptr) + cls = *(const AVClass *const*)ptr; + + if (cls != nullptr) { + char domain[64]; + snprintf(domain, sizeof(domain), "%s/%s", + ffmpeg_domain.GetName(), cls->item_name(ptr)); + const Domain d(domain); + LogFormatV(d, import_ffmpeg_level(level), fmt, vl); + } +} + +struct AvioStream { + Decoder *const decoder; + InputStream &input; + + AVIOContext *io; + + unsigned char buffer[8192]; + + AvioStream(Decoder *_decoder, InputStream &_input) + :decoder(_decoder), input(_input), io(nullptr) {} + + ~AvioStream() { + if (io != nullptr) + av_free(io); + } + + bool Open(); +}; + +static int +mpd_ffmpeg_stream_read(void *opaque, uint8_t *buf, int size) +{ + AvioStream *stream = (AvioStream *)opaque; + + return decoder_read(stream->decoder, stream->input, + (void *)buf, size); +} + +static int64_t +mpd_ffmpeg_stream_seek(void *opaque, int64_t pos, int whence) +{ + AvioStream *stream = (AvioStream *)opaque; + + switch (whence) { + case SEEK_SET: + break; + + case SEEK_CUR: + pos += stream->input.GetOffset(); + break; + + case SEEK_END: + if (!stream->input.KnownSize()) + return -1; + + pos += stream->input.GetSize(); + break; + + case AVSEEK_SIZE: + if (!stream->input.KnownSize()) + return -1; + + return stream->input.GetSize(); + + default: + return -1; + } + + if (!stream->input.LockSeek(pos, IgnoreError())) + return -1; + + return stream->input.GetOffset(); +} + +bool +AvioStream::Open() +{ + io = avio_alloc_context(buffer, sizeof(buffer), + false, this, + mpd_ffmpeg_stream_read, nullptr, + input.IsSeekable() + ? mpd_ffmpeg_stream_seek : nullptr); + return io != nullptr; +} + +/** + * API compatibility wrapper for av_open_input_stream() and + * avformat_open_input(). + */ +static int +mpd_ffmpeg_open_input(AVFormatContext **ic_ptr, + AVIOContext *pb, + const char *filename, + AVInputFormat *fmt) +{ + AVFormatContext *context = avformat_alloc_context(); + if (context == nullptr) + return AVERROR(ENOMEM); + + context->pb = pb; + *ic_ptr = context; + return avformat_open_input(ic_ptr, filename, fmt, nullptr); +} + +static bool +ffmpeg_init(gcc_unused const config_param ¶m) +{ + av_log_set_callback(mpd_ffmpeg_log_callback); + + av_register_all(); + return true; +} + +static int +ffmpeg_find_audio_stream(const AVFormatContext *format_context) +{ + for (unsigned i = 0; i < format_context->nb_streams; ++i) + if (format_context->streams[i]->codec->codec_type == + AVMEDIA_TYPE_AUDIO) + return i; + + return -1; +} + +gcc_const +static double +time_from_ffmpeg(int64_t t, const AVRational time_base) +{ + assert(t != (int64_t)AV_NOPTS_VALUE); + + return (double)av_rescale_q(t, time_base, (AVRational){1, 1024}) + / (double)1024; +} + +template<typename Ratio> +static constexpr AVRational +RatioToAVRational() +{ + return { Ratio::num, Ratio::den }; +} + +gcc_const +static int64_t +time_to_ffmpeg(SongTime t, const AVRational time_base) +{ + return av_rescale_q(t.count(), + RatioToAVRational<SongTime::period>(), + time_base); +} + +/** + * Replace #AV_NOPTS_VALUE with the given fallback. + */ +static constexpr int64_t +timestamp_fallback(int64_t t, int64_t fallback) +{ + return gcc_likely(t != int64_t(AV_NOPTS_VALUE)) + ? t + : fallback; +} + +/** + * Accessor for AVStream::start_time that replaces AV_NOPTS_VALUE with + * zero. We can't use AV_NOPTS_VALUE in calculations, and we simply + * assume that the stream's start time is zero, which appears to be + * the best way out of that situation. + */ +static int64_t +start_time_fallback(const AVStream &stream) +{ + return timestamp_fallback(stream.start_time, 0); +} + +static void +copy_interleave_frame2(uint8_t *dest, uint8_t **src, + unsigned nframes, unsigned nchannels, + unsigned sample_size) +{ + for (unsigned frame = 0; frame < nframes; ++frame) { + for (unsigned channel = 0; channel < nchannels; ++channel) { + memcpy(dest, src[channel] + frame * sample_size, + sample_size); + dest += sample_size; + } + } +} + +/** + * Copy PCM data from a AVFrame to an interleaved buffer. + */ +static int +copy_interleave_frame(const AVCodecContext *codec_context, + const AVFrame *frame, + uint8_t **output_buffer, + uint8_t **global_buffer, int *global_buffer_size) +{ + int plane_size; + const int data_size = + av_samples_get_buffer_size(&plane_size, + codec_context->channels, + frame->nb_samples, + codec_context->sample_fmt, 1); + if (data_size <= 0) + return data_size; + + if (av_sample_fmt_is_planar(codec_context->sample_fmt) && + codec_context->channels > 1) { + if(*global_buffer_size < data_size) { + av_freep(global_buffer); + + *global_buffer = (uint8_t*)av_malloc(data_size); + + if (!*global_buffer) + /* Not enough memory - shouldn't happen */ + return AVERROR(ENOMEM); + *global_buffer_size = data_size; + } + *output_buffer = *global_buffer; + copy_interleave_frame2(*output_buffer, frame->extended_data, + frame->nb_samples, + codec_context->channels, + av_get_bytes_per_sample(codec_context->sample_fmt)); + } else { + *output_buffer = frame->extended_data[0]; + } + + return data_size; +} + +static DecoderCommand +ffmpeg_send_packet(Decoder &decoder, InputStream &is, + const AVPacket *packet, + AVCodecContext *codec_context, + const AVStream *stream, + AVFrame *frame, + uint8_t **buffer, int *buffer_size) +{ + if (packet->pts >= 0 && packet->pts != (int64_t)AV_NOPTS_VALUE) { + auto start = start_time_fallback(*stream); + if (packet->pts >= start) + decoder_timestamp(decoder, + time_from_ffmpeg(packet->pts - start, + stream->time_base)); + } + + AVPacket packet2 = *packet; + + uint8_t *output_buffer; + + DecoderCommand cmd = DecoderCommand::NONE; + while (packet2.size > 0 && cmd == DecoderCommand::NONE) { + int audio_size = 0; + int got_frame = 0; + int len = avcodec_decode_audio4(codec_context, + frame, &got_frame, + &packet2); + if (len >= 0 && got_frame) { + audio_size = copy_interleave_frame(codec_context, + frame, + &output_buffer, + buffer, buffer_size); + if (audio_size < 0) + len = audio_size; + } + + if (len < 0) { + /* if error, we skip the frame */ + LogDefault(ffmpeg_domain, + "decoding failed, frame skipped"); + break; + } + + packet2.data += len; + packet2.size -= len; + + if (audio_size <= 0) + continue; + + cmd = decoder_data(decoder, is, + output_buffer, audio_size, + codec_context->bit_rate / 1000); + } + return cmd; +} + +gcc_const +static SampleFormat +ffmpeg_sample_format(enum AVSampleFormat sample_fmt) +{ + switch (sample_fmt) { + case AV_SAMPLE_FMT_S16: + case AV_SAMPLE_FMT_S16P: + return SampleFormat::S16; + + case AV_SAMPLE_FMT_S32: + case AV_SAMPLE_FMT_S32P: + return SampleFormat::S32; + + case AV_SAMPLE_FMT_FLT: + case AV_SAMPLE_FMT_FLTP: + return SampleFormat::FLOAT; + + default: + break; + } + + char buffer[64]; + const char *name = av_get_sample_fmt_string(buffer, sizeof(buffer), + sample_fmt); + if (name != nullptr) + FormatError(ffmpeg_domain, + "Unsupported libavcodec SampleFormat value: %s (%d)", + name, sample_fmt); + else + FormatError(ffmpeg_domain, + "Unsupported libavcodec SampleFormat value: %d", + sample_fmt); + return SampleFormat::UNDEFINED; +} + +static AVInputFormat * +ffmpeg_probe(Decoder *decoder, InputStream &is) +{ + enum { + BUFFER_SIZE = 16384, + PADDING = 16, + }; + + unsigned char buffer[BUFFER_SIZE]; + size_t nbytes = decoder_read(decoder, is, buffer, BUFFER_SIZE); + if (nbytes <= PADDING || !is.LockRewind(IgnoreError())) + return nullptr; + + /* some ffmpeg parsers (e.g. ac3_parser.c) read a few bytes + beyond the declared buffer limit, which makes valgrind + angry; this workaround removes some padding from the buffer + size */ + nbytes -= PADDING; + + AVProbeData avpd; + + /* new versions of ffmpeg may add new attributes, and leaving + them uninitialized may crash; hopefully, zero-initializing + everything we don't know is ok */ + memset(&avpd, 0, sizeof(avpd)); + + avpd.buf = buffer; + avpd.buf_size = nbytes; + avpd.filename = is.GetURI(); + +#ifdef AVPROBE_SCORE_MIME +#if LIBAVFORMAT_VERSION_INT < AV_VERSION_INT(56, 5, 1) + /* this attribute was added in libav/ffmpeg version 11, but + unfortunately it's "uint8_t" instead of "char", and it's + not "const" - wtf? */ + avpd.mime_type = (uint8_t *)const_cast<char *>(is.GetMimeType()); +#else + /* API problem fixed in FFmpeg 2.5 */ + avpd.mime_type = is.GetMimeType(); +#endif +#endif + + return av_probe_input_format(&avpd, true); +} + +static void +ffmpeg_decode(Decoder &decoder, InputStream &input) +{ + AVInputFormat *input_format = ffmpeg_probe(&decoder, input); + if (input_format == nullptr) + return; + + FormatDebug(ffmpeg_domain, "detected input format '%s' (%s)", + input_format->name, input_format->long_name); + + AvioStream stream(&decoder, input); + if (!stream.Open()) { + LogError(ffmpeg_domain, "Failed to open stream"); + return; + } + + //ffmpeg works with ours "fileops" helper + AVFormatContext *format_context = nullptr; + if (mpd_ffmpeg_open_input(&format_context, stream.io, + input.GetURI(), + input_format) != 0) { + LogError(ffmpeg_domain, "Open failed"); + return; + } + + const int find_result = + avformat_find_stream_info(format_context, nullptr); + if (find_result < 0) { + LogError(ffmpeg_domain, "Couldn't find stream info"); + avformat_close_input(&format_context); + return; + } + + int audio_stream = ffmpeg_find_audio_stream(format_context); + if (audio_stream == -1) { + LogError(ffmpeg_domain, "No audio stream inside"); + avformat_close_input(&format_context); + return; + } + + AVStream *av_stream = format_context->streams[audio_stream]; + + AVCodecContext *codec_context = av_stream->codec; + +#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(54, 25, 0) + const AVCodecDescriptor *codec_descriptor = + avcodec_descriptor_get(codec_context->codec_id); + if (codec_descriptor != nullptr) + FormatDebug(ffmpeg_domain, "codec '%s'", + codec_descriptor->name); +#else + if (codec_context->codec_name[0] != 0) + FormatDebug(ffmpeg_domain, "codec '%s'", + codec_context->codec_name); +#endif + + AVCodec *codec = avcodec_find_decoder(codec_context->codec_id); + + if (!codec) { + LogError(ffmpeg_domain, "Unsupported audio codec"); + avformat_close_input(&format_context); + return; + } + + const SampleFormat sample_format = + ffmpeg_sample_format(codec_context->sample_fmt); + if (sample_format == SampleFormat::UNDEFINED) { + // (error message already done by ffmpeg_sample_format()) + avformat_close_input(&format_context); + return; + } + + Error error; + AudioFormat audio_format; + if (!audio_format_init_checked(audio_format, + codec_context->sample_rate, + sample_format, + codec_context->channels, error)) { + LogError(error); + avformat_close_input(&format_context); + return; + } + + /* the audio format must be read from AVCodecContext by now, + because avcodec_open() has been demonstrated to fill bogus + values into AVCodecContext.channels - a change that will be + reverted later by avcodec_decode_audio3() */ + + const int open_result = avcodec_open2(codec_context, codec, nullptr); + if (open_result < 0) { + LogError(ffmpeg_domain, "Could not open codec"); + avformat_close_input(&format_context); + return; + } + + const SignedSongTime total_time = + format_context->duration != (int64_t)AV_NOPTS_VALUE + ? SignedSongTime::FromScale<uint64_t>(format_context->duration, + AV_TIME_BASE) + : SignedSongTime::Negative(); + + decoder_initialized(decoder, audio_format, + input.IsSeekable(), total_time); + +#if LIBAVUTIL_VERSION_MAJOR >= 53 + AVFrame *frame = av_frame_alloc(); +#else + AVFrame *frame = avcodec_alloc_frame(); +#endif + if (!frame) { + LogError(ffmpeg_domain, "Could not allocate frame"); + avformat_close_input(&format_context); + return; + } + + uint8_t *interleaved_buffer = nullptr; + int interleaved_buffer_size = 0; + + DecoderCommand cmd; + do { + AVPacket packet; + if (av_read_frame(format_context, &packet) < 0) + /* end of file */ + break; + + if (packet.stream_index == audio_stream) + cmd = ffmpeg_send_packet(decoder, input, + &packet, codec_context, + av_stream, + frame, + &interleaved_buffer, &interleaved_buffer_size); + else + cmd = decoder_get_command(decoder); + + av_free_packet(&packet); + + if (cmd == DecoderCommand::SEEK) { + int64_t where = + time_to_ffmpeg(decoder_seek_time(decoder), + av_stream->time_base) + + start_time_fallback(*av_stream); + + if (av_seek_frame(format_context, audio_stream, where, + AVSEEK_FLAG_ANY) < 0) + decoder_seek_error(decoder); + else { + avcodec_flush_buffers(codec_context); + decoder_command_finished(decoder); + } + } + } while (cmd != DecoderCommand::STOP); + +#if LIBAVUTIL_VERSION_MAJOR >= 53 + av_frame_free(&frame); +#elif LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(54, 28, 0) + avcodec_free_frame(&frame); +#else + av_freep(&frame); +#endif + av_freep(&interleaved_buffer); + + avcodec_close(codec_context); + avformat_close_input(&format_context); +} + +//no tag reading in ffmpeg, check if playable +static bool +ffmpeg_scan_stream(InputStream &is, + const struct tag_handler *handler, void *handler_ctx) +{ + AVInputFormat *input_format = ffmpeg_probe(nullptr, is); + if (input_format == nullptr) + return false; + + AvioStream stream(nullptr, is); + if (!stream.Open()) + return false; + + AVFormatContext *f = nullptr; + if (mpd_ffmpeg_open_input(&f, stream.io, is.GetURI(), + input_format) != 0) + return false; + + const int find_result = + avformat_find_stream_info(f, nullptr); + if (find_result < 0) { + avformat_close_input(&f); + return false; + } + + if (f->duration != (int64_t)AV_NOPTS_VALUE) { + const auto duration = + SongTime::FromScale<uint64_t>(f->duration, + AV_TIME_BASE); + tag_handler_invoke_duration(handler, handler_ctx, duration); + } + + ffmpeg_scan_dictionary(f->metadata, handler, handler_ctx); + int idx = ffmpeg_find_audio_stream(f); + if (idx >= 0) + ffmpeg_scan_dictionary(f->streams[idx]->metadata, + handler, handler_ctx); + + avformat_close_input(&f); + return true; +} + +/** + * A list of extensions found for the formats supported by ffmpeg. + * This list is current as of 02-23-09; To find out if there are more + * supported formats, check the ffmpeg changelog since this date for + * more formats. + */ +static const char *const ffmpeg_suffixes[] = { + "16sv", "3g2", "3gp", "4xm", "8svx", "aa3", "aac", "ac3", "afc", "aif", + "aifc", "aiff", "al", "alaw", "amr", "anim", "apc", "ape", "asf", + "atrac", "au", "aud", "avi", "avm2", "avs", "bap", "bfi", "c93", "cak", + "cin", "cmv", "cpk", "daud", "dct", "divx", "dts", "dv", "dvd", "dxa", + "eac3", "film", "flac", "flc", "fli", "fll", "flx", "flv", "g726", + "gsm", "gxf", "iss", "m1v", "m2v", "m2t", "m2ts", + "m4a", "m4b", "m4v", + "mad", + "mj2", "mjpeg", "mjpg", "mka", "mkv", "mlp", "mm", "mmf", "mov", "mp+", + "mp1", "mp2", "mp3", "mp4", "mpc", "mpeg", "mpg", "mpga", "mpp", "mpu", + "mve", "mvi", "mxf", "nc", "nsv", "nut", "nuv", "oga", "ogm", "ogv", + "ogx", "oma", "ogg", "omg", "opus", "psp", "pva", "qcp", "qt", "r3d", "ra", + "ram", "rl2", "rm", "rmvb", "roq", "rpl", "rvc", "shn", "smk", "snd", + "sol", "son", "spx", "str", "swf", "tgi", "tgq", "tgv", "thp", "ts", + "tsp", "tta", "xa", "xvid", "uv", "uv2", "vb", "vid", "vob", "voc", + "vp6", "vmd", "wav", "webm", "wma", "wmv", "wsaud", "wsvga", "wv", + "wve", + nullptr +}; + +static const char *const ffmpeg_mime_types[] = { + "application/flv", + "application/m4a", + "application/mp4", + "application/octet-stream", + "application/ogg", + "application/x-ms-wmz", + "application/x-ms-wmd", + "application/x-ogg", + "application/x-shockwave-flash", + "application/x-shorten", + "audio/8svx", + "audio/16sv", + "audio/aac", + "audio/aacp", + "audio/ac3", + "audio/aiff" + "audio/amr", + "audio/basic", + "audio/flac", + "audio/m4a", + "audio/mp4", + "audio/mpeg", + "audio/musepack", + "audio/ogg", + "audio/opus", + "audio/qcelp", + "audio/vorbis", + "audio/vorbis+ogg", + "audio/x-8svx", + "audio/x-16sv", + "audio/x-aac", + "audio/x-ac3", + "audio/x-aiff" + "audio/x-alaw", + "audio/x-au", + "audio/x-dca", + "audio/x-eac3", + "audio/x-flac", + "audio/x-gsm", + "audio/x-mace", + "audio/x-matroska", + "audio/x-monkeys-audio", + "audio/x-mpeg", + "audio/x-ms-wma", + "audio/x-ms-wax", + "audio/x-musepack", + "audio/x-ogg", + "audio/x-vorbis", + "audio/x-vorbis+ogg", + "audio/x-pn-realaudio", + "audio/x-pn-multirate-realaudio", + "audio/x-speex", + "audio/x-tta" + "audio/x-voc", + "audio/x-wav", + "audio/x-wma", + "audio/x-wv", + "video/anim", + "video/quicktime", + "video/msvideo", + "video/ogg", + "video/theora", + "video/webm", + "video/x-dv", + "video/x-flv", + "video/x-matroska", + "video/x-mjpeg", + "video/x-mpeg", + "video/x-ms-asf", + "video/x-msvideo", + "video/x-ms-wmv", + "video/x-ms-wvx", + "video/x-ms-wm", + "video/x-ms-wmx", + "video/x-nut", + "video/x-pva", + "video/x-theora", + "video/x-vid", + "video/x-wmv", + "video/x-xvid", + + /* special value for the "ffmpeg" input plugin: all streams by + the "ffmpeg" input plugin shall be decoded by this + plugin */ + "audio/x-mpd-ffmpeg", + + nullptr +}; + +const struct DecoderPlugin ffmpeg_decoder_plugin = { + "ffmpeg", + ffmpeg_init, + nullptr, + ffmpeg_decode, + nullptr, + nullptr, + ffmpeg_scan_stream, + nullptr, + ffmpeg_suffixes, + ffmpeg_mime_types +}; |