mirror of https://github.com/FFmpeg/FFmpeg.git
Reviewed-by: Stefano Sabatini <stefasab@gmail.com> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>pull/26/merge
wm4
12 years ago
committed by
Michael Niedermayer
parent
0472f64c55
commit
c3316ddb83
7 changed files with 223 additions and 2 deletions
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/*
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/**
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* @file |
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* libgme demuxer |
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*/ |
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#include <gme/gme.h> |
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#include "libavutil/avstring.h" |
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#include "libavutil/eval.h" |
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#include "libavutil/opt.h" |
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#include "avformat.h" |
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#include "internal.h" |
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typedef struct GMEContext { |
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const AVClass *class; |
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Music_Emu *music_emu; |
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gme_info_t *info; ///< selected track
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/* options */ |
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int track_index; |
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int sample_rate; |
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int64_t max_size; |
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} GMEContext; |
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#define OFFSET(x) offsetof(GMEContext, x) |
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#define A AV_OPT_FLAG_AUDIO_PARAM |
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#define D AV_OPT_FLAG_DECODING_PARAM |
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static const AVOption options[] = { |
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{"track_index", "set track that should be played", OFFSET(track_index), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, A|D}, |
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{"sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 1000, 999999, A|D}, |
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{"max_size", "set max file size supported (in bytes)", OFFSET(max_size), AV_OPT_TYPE_INT64, {.i64 = 50 * 1024 * 1024}, 0, SIZE_MAX, A|D}, |
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{NULL} |
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}; |
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static void add_meta(AVFormatContext *s, const char *name, const char *value) |
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{ |
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if (value && value[0]) |
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av_dict_set(&s->metadata, name, value, 0); |
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} |
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static int load_metadata(AVFormatContext *s) |
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{ |
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GMEContext *gme = s->priv_data; |
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gme_info_t *info = gme->info; |
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char buf[30]; |
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add_meta(s, "system", info->system); |
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add_meta(s, "game", info->game); |
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add_meta(s, "song", info->song); |
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add_meta(s, "author", info->author); |
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add_meta(s, "copyright", info->copyright); |
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add_meta(s, "comment", info->comment); |
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add_meta(s, "dumper", info->dumper); |
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snprintf(buf, sizeof(buf), "%d", (int)gme_track_count(gme->music_emu)); |
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add_meta(s, "tracks", buf); |
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return 0; |
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} |
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#define AUDIO_PKT_SIZE 512 |
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static int read_header_gme(AVFormatContext *s) |
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{ |
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AVStream *st; |
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AVIOContext *pb = s->pb; |
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GMEContext *gme = s->priv_data; |
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int64_t sz = avio_size(pb); |
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char *buf; |
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char dummy; |
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if (sz < 0) { |
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av_log(s, AV_LOG_WARNING, "Could not determine file size\n"); |
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sz = gme->max_size; |
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} else if (gme->max_size && sz > gme->max_size) { |
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sz = gme->max_size; |
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} |
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buf = av_malloc(sz); |
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if (!buf) |
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return AVERROR(ENOMEM); |
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sz = avio_read(pb, buf, sz); |
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// Data left means our buffer (the max_size option) is too small
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if (avio_read(pb, &dummy, 1) == 1) { |
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av_log(s, AV_LOG_ERROR, "File size is larger than max_size option " |
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"value %"PRIi64", consider increasing the max_size option\n", |
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gme->max_size); |
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return AVERROR_BUFFER_TOO_SMALL; |
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} |
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if (gme_open_data(buf, sz, &gme->music_emu, gme->sample_rate)) { |
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av_freep(&buf); |
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return AVERROR_INVALIDDATA; |
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} |
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av_freep(&buf); |
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if (gme_track_info(gme->music_emu, &gme->info, gme->track_index)) |
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return AVERROR_STREAM_NOT_FOUND; |
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if (gme_start_track(gme->music_emu, gme->track_index)) |
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return AVERROR_UNKNOWN; |
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load_metadata(s); |
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st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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avpriv_set_pts_info(st, 64, 1, 1000); |
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if (st->duration > 0) |
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st->duration = gme->info->length; |
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codec->codec_id = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE); |
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st->codec->channels = 2; |
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st->codec->sample_rate = gme->sample_rate; |
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return 0; |
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} |
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static int read_packet_gme(AVFormatContext *s, AVPacket *pkt) |
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{ |
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GMEContext *gme = s->priv_data; |
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int n_samples = AUDIO_PKT_SIZE / 2; |
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int ret; |
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if (gme_track_ended(gme->music_emu)) |
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return AVERROR_EOF; |
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if ((ret = av_new_packet(pkt, AUDIO_PKT_SIZE)) < 0) |
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return ret; |
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if (gme_play(gme->music_emu, n_samples, (short *)pkt->data)) |
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return AVERROR_EXTERNAL; |
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pkt->size = AUDIO_PKT_SIZE; |
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return 0; |
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} |
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static int read_close_gme(AVFormatContext *s) |
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{ |
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GMEContext *gme = s->priv_data; |
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gme_free_info(gme->info); |
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gme_delete(gme->music_emu); |
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return 0; |
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} |
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static int read_seek_gme(AVFormatContext *s, int stream_idx, int64_t ts, int flags) |
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{ |
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GMEContext *gme = s->priv_data; |
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if (!gme_seek(gme->music_emu, (int)ts)) |
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return AVERROR_EXTERNAL; |
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return 0; |
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} |
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static int probe_gme(AVProbeData *p) |
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{ |
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// Reads 4 bytes - returns "" if unknown format.
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if (gme_identify_header(p->buf)[0]) { |
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if (p->buf_size < 16384) |
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return AVPROBE_SCORE_MAX / 4 + 1; |
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else |
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return AVPROBE_SCORE_MAX / 2; |
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} |
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return 0; |
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} |
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static const AVClass class_gme = { |
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.class_name = "Game Music Emu demuxer", |
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.item_name = av_default_item_name, |
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.option = options, |
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.version = LIBAVUTIL_VERSION_INT, |
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}; |
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AVInputFormat ff_libgme_demuxer = { |
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.name = "libgme", |
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.long_name = NULL_IF_CONFIG_SMALL("Game Music Emu demuxer"), |
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.priv_data_size = sizeof(GMEContext), |
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.read_probe = probe_gme, |
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.read_header = read_header_gme, |
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.read_packet = read_packet_gme, |
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.read_close = read_close_gme, |
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.read_seek = read_seek_gme, |
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.priv_class = &class_gme, |
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}; |
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