/* the Music Player Daemon (MPD) * Copyright (C) 2008 Viliam Mateicka <viliam.mateicka@gmail.com> * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "../decoder_api.h" #include "../log.h" #include <assert.h> #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <string.h> #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> #ifdef OLD_FFMPEG_INCLUDES #include <avcodec.h> #include <avformat.h> #include <avio.h> #else #include <libavcodec/avcodec.h> #include <libavformat/avformat.h> #include <libavformat/avio.h> #endif struct ffmpeg_context { int audio_stream; AVFormatContext *format_context; AVCodecContext *codec_context; struct decoder *decoder; struct input_stream *input; struct tag *tag; }; struct ffmpeg_stream { /** hack - see url_to_struct() */ char url[8]; struct decoder *decoder; struct input_stream *input; }; /** * Convert a faked mpd:// URL to a ffmpeg_stream structure. This is a * hack because ffmpeg does not provide a nice API for passing a * user-defined pointer to mpdurl_open(). */ static struct ffmpeg_stream *url_to_struct(const char *url) { union { const char *in; struct ffmpeg_stream *out; } u = { .in = url }; return u.out; } static int mpd_ffmpeg_open(URLContext *h, const char *filename, mpd_unused int flags) { struct ffmpeg_stream *stream = url_to_struct(filename); h->priv_data = stream; h->is_streamed = stream->input->seekable ? 0 : 1; return 0; } static int mpd_ffmpeg_read(URLContext *h, unsigned char *buf, int size) { struct ffmpeg_stream *stream = (struct ffmpeg_stream *) h->priv_data; return decoder_read(stream->decoder, stream->input, (void *)buf, size); } static int64_t mpd_ffmpeg_seek(URLContext *h, int64_t pos, int whence) { struct ffmpeg_stream *stream = (struct ffmpeg_stream *) h->priv_data; if (whence != AVSEEK_SIZE) { //only ftell (void) input_stream_seek(stream->input, pos, whence); } return stream->input->offset; } static int mpd_ffmpeg_close(URLContext *h) { h->priv_data = 0; return 0; } static URLProtocol mpd_ffmpeg_fileops = { .name = "mpd", .url_open = mpd_ffmpeg_open, .url_read = mpd_ffmpeg_read, .url_seek = mpd_ffmpeg_seek, .url_close = mpd_ffmpeg_close, }; static bool ffmpeg_init(void) { av_register_all(); register_protocol(&mpd_ffmpeg_fileops); 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 == CODEC_TYPE_AUDIO) return i; return -1; } static bool ffmpeg_helper(struct input_stream *input, bool (*callback)(struct ffmpeg_context *ctx), struct ffmpeg_context *ctx) { AVFormatContext *format_context; AVCodecContext *codec_context; AVCodec *codec; int audio_stream; struct ffmpeg_stream stream = { .url = "mpd://X", /* only the mpd:// prefix matters */ }; bool ret; stream.input = input; if (ctx && ctx->decoder) { stream.decoder = ctx->decoder; //are we in decoding loop ? } else { stream.decoder = NULL; } //ffmpeg works with ours "fileops" helper if (av_open_input_file(&format_context, stream.url, NULL, 0, NULL) != 0) { ERROR("Open failed!\n"); return false; } if (av_find_stream_info(format_context)<0) { ERROR("Couldn't find stream info!\n"); return false; } audio_stream = ffmpeg_find_audio_stream(format_context); if (audio_stream == -1) { ERROR("No audio stream inside!\n"); return false; } codec_context = format_context->streams[audio_stream]->codec; codec = avcodec_find_decoder(codec_context->codec_id); if (!codec) { ERROR("Unsupported audio codec!\n"); return false; } if (avcodec_open(codec_context, codec)<0) { ERROR("Could not open codec!\n"); return false; } if (callback) { ctx->audio_stream = audio_stream; ctx->format_context = format_context; ctx->codec_context = codec_context; ret = callback(ctx); } else ret = true; avcodec_close(codec_context); av_close_input_file(format_context); return ret; } static enum decoder_command ffmpeg_send_packet(struct decoder *decoder, struct input_stream *is, const AVPacket *packet, AVCodecContext *codec_context, const AVRational *time_base) { int position; uint8_t audio_buf[(AVCODEC_MAX_AUDIO_FRAME_SIZE * 3) / 2]; int len, audio_size; position = av_rescale_q(packet->pts, *time_base, (AVRational){1, 1}); audio_size = sizeof(audio_buf); len = avcodec_decode_audio2(codec_context, (int16_t *)audio_buf, &audio_size, packet->data, packet->size); if (len < 0) { WARNING("skipping frame!\n"); return decoder_get_command(decoder); } assert(audio_size >= 0); return decoder_data(decoder, is, audio_buf, audio_size, position, codec_context->bit_rate / 1000, NULL); } static bool ffmpeg_decode_internal(struct ffmpeg_context *ctx) { struct decoder *decoder = ctx->decoder; AVCodecContext *codec_context = ctx->codec_context; AVFormatContext *format_context = ctx->format_context; AVPacket packet; struct audio_format audio_format; enum decoder_command cmd; int current, total_time; total_time = 0; if (codec_context->channels > 2) { codec_context->channels = 2; } audio_format.bits = (uint8_t)16; audio_format.sample_rate = (unsigned int)codec_context->sample_rate; audio_format.channels = codec_context->channels; //there is some problem with this on some demux (mp3 at least) if (format_context->duration != (int)AV_NOPTS_VALUE) { total_time = format_context->duration / AV_TIME_BASE; } decoder_initialized(decoder, &audio_format, ctx->input->seekable, total_time); do { if (av_read_frame(format_context, &packet) < 0) /* end of file */ break; if (packet.stream_index == ctx->audio_stream) cmd = ffmpeg_send_packet(decoder, ctx->input, &packet, codec_context, &format_context->streams[ctx->audio_stream]->time_base); else cmd = decoder_get_command(decoder); av_free_packet(&packet); if (cmd == DECODE_COMMAND_SEEK) { current = decoder_seek_where(decoder) * AV_TIME_BASE; if (av_seek_frame(format_context, -1, current, 0) < 0) decoder_seek_error(decoder); else decoder_command_finished(decoder); } } while (cmd != DECODE_COMMAND_STOP); return true; } static void ffmpeg_decode(struct decoder *decoder, struct input_stream *input) { struct ffmpeg_context ctx; ctx.input = input; ctx.decoder = decoder; ffmpeg_helper(input, ffmpeg_decode_internal, &ctx); } static bool ffmpeg_tag_internal(struct ffmpeg_context *ctx) { struct tag *tag = (struct tag *) ctx->tag; if (ctx->format_context->duration != (int)AV_NOPTS_VALUE) { tag->time = ctx->format_context->duration / AV_TIME_BASE; } else { tag->time = 0; } return true; } //no tag reading in ffmpeg, check if playable static struct tag *ffmpeg_tag(const char *file) { struct input_stream input; struct ffmpeg_context ctx; bool ret; if (!input_stream_open(&input, file)) { ERROR("failed to open %s\n", file); return NULL; } ctx.decoder = NULL; ctx.tag = tag_new(); ret = ffmpeg_helper(&input, ffmpeg_tag_internal, &ctx); if (!ret) { tag_free(ctx.tag); ctx.tag = NULL; } input_stream_close(&input); return ctx.tag; } /** * ffmpeg can decode almost everything from open codecs * and also some of propietary codecs * its hard to tell what can ffmpeg decode * we can later put this into configure script * to be sure ffmpeg is used to handle * only that files */ static const char *const ffmpeg_suffixes[] = { "wma", "asf", "wmv", "mpeg", "mpg", "avi", "vob", "mov", "qt", "swf", "rm", "swf", "mp1", "mp2", "mp3", "mp4", "m4a", "flac", "ogg", "wav", "au", "aiff", "aif", "ac3", "aac", "mpc", NULL }; //not sure if this is correct... static const char *const ffmpeg_mime_types[] = { "video/x-ms-asf", "audio/x-ms-wma", "audio/x-ms-wax", "video/x-ms-wmv", "video/x-ms-wvx", "video/x-ms-wm", "video/x-ms-wmx", "application/x-ms-wmz", "application/x-ms-wmd", "audio/mpeg", NULL }; const struct decoder_plugin ffmpeg_plugin = { .name = "ffmpeg", .init = ffmpeg_init, .stream_decode = ffmpeg_decode, .tag_dup = ffmpeg_tag, .suffixes = ffmpeg_suffixes, .mime_types = ffmpeg_mime_types };