mirror of
https://git.videolan.org/git/ffmpeg.git
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202 lines
5.8 KiB
C
202 lines
5.8 KiB
C
/*
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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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE);
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st->codecpar->channels = 2;
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st->codecpar->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(const 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 ;
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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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