/*
- * Rayman 2 APM Demuxer
+ * Rayman 2 APM (De)muxer
*
* Copyright (C) 2020 Zane van Iperen (zane@zanevaniperen.com)
*
*/
#include "avformat.h"
#include "internal.h"
-#include "riff.h"
+#include "rawenc.h"
+#include "libavutil/avassert.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#define APM_FILE_HEADER_SIZE 20
-#define APM_VS12_CHUNK_SIZE 76
+#define APM_FILE_EXTRADATA_SIZE 80
+#define APM_EXTRADATA_SIZE 28
+
#define APM_MAX_READ_SIZE 4096
#define APM_TAG_CODEC 0x2000
int32_t saved_l;
} APMState;
-typedef struct APMVS12Chunk {
+typedef struct APMExtraData {
uint32_t magic;
uint32_t file_size;
uint32_t data_size;
uint32_t unk1;
uint32_t unk2;
APMState state;
- uint32_t pad[7];
-} APMVS12Chunk;
+ uint32_t unk3[7];
+ uint32_t data;
+} APMExtraData;
-static void apm_parse_vs12(APMVS12Chunk *vs12, const uint8_t *buf)
+#if CONFIG_APM_DEMUXER
+static void apm_parse_extradata(APMExtraData *ext, const uint8_t *buf)
{
- vs12->magic = AV_RL32(buf + 0);
- vs12->file_size = AV_RL32(buf + 4);
- vs12->data_size = AV_RL32(buf + 8);
- vs12->unk1 = AV_RL32(buf + 12);
- vs12->unk2 = AV_RL32(buf + 16);
-
- vs12->state.has_saved = AV_RL32(buf + 20);
- vs12->state.predictor_r = AV_RL32(buf + 24);
- vs12->state.step_index_r = AV_RL32(buf + 28);
- vs12->state.saved_r = AV_RL32(buf + 32);
- vs12->state.predictor_l = AV_RL32(buf + 36);
- vs12->state.step_index_l = AV_RL32(buf + 40);
- vs12->state.saved_l = AV_RL32(buf + 44);
-
- for (int i = 0; i < FF_ARRAY_ELEMS(vs12->pad); i++)
- vs12->pad[i] = AV_RL32(buf + 48 + (i * 4));
+ ext->magic = AV_RL32(buf + 0);
+ ext->file_size = AV_RL32(buf + 4);
+ ext->data_size = AV_RL32(buf + 8);
+ ext->unk1 = AV_RL32(buf + 12);
+ ext->unk2 = AV_RL32(buf + 16);
+
+ ext->state.has_saved = AV_RL32(buf + 20);
+ ext->state.predictor_r = AV_RL32(buf + 24);
+ ext->state.step_index_r = AV_RL32(buf + 28);
+ ext->state.saved_r = AV_RL32(buf + 32);
+ ext->state.predictor_l = AV_RL32(buf + 36);
+ ext->state.step_index_l = AV_RL32(buf + 40);
+ ext->state.saved_l = AV_RL32(buf + 44);
+
+ for (int i = 0; i < FF_ARRAY_ELEMS(ext->unk3); i++)
+ ext->unk3[i] = AV_RL32(buf + 48 + (i * 4));
+
+ ext->data = AV_RL32(buf + 76);
}
static int apm_probe(const AVProbeData *p)
{
int64_t ret;
AVStream *st;
- APMVS12Chunk vs12;
- uint8_t buf[APM_VS12_CHUNK_SIZE];
+ APMExtraData extradata;
+ AVCodecParameters *par;
+ uint8_t buf[APM_FILE_EXTRADATA_SIZE];
if (!(st = avformat_new_stream(s, NULL)))
return AVERROR(ENOMEM);
- /* The header starts with a WAVEFORMATEX */
- if ((ret = ff_get_wav_header(s, s->pb, st->codecpar, APM_FILE_HEADER_SIZE, 0)) < 0)
+ /*
+ * This is 98% a WAVEFORMATEX, but there's something screwy with the extradata
+ * that ff_get_wav_header() can't (and shouldn't) handle properly.
+ */
+ if (avio_rl16(s->pb) != APM_TAG_CODEC)
+ return AVERROR_INVALIDDATA;
+
+ par = st->codecpar;
+ par->channels = avio_rl16(s->pb);
+ par->sample_rate = avio_rl32(s->pb);
+
+ /* Skip the bitrate, it's usually wrong anyway. */
+ if ((ret = avio_skip(s->pb, 4)) < 0)
return ret;
- if (st->codecpar->bits_per_coded_sample != 4)
+ par->block_align = avio_rl16(s->pb);
+ par->bits_per_coded_sample = avio_rl16(s->pb);
+
+ if (avio_rl32(s->pb) != APM_FILE_EXTRADATA_SIZE)
return AVERROR_INVALIDDATA;
- if (st->codecpar->codec_tag != APM_TAG_CODEC)
+ /* 8 = bits per sample * max channels */
+ if (par->sample_rate > (INT_MAX / 8))
return AVERROR_INVALIDDATA;
- /* ff_get_wav_header() does most of the work, but we need to fix a few things. */
- st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_APM;
- st->codecpar->codec_tag = 0;
+ if (par->bits_per_coded_sample != 4)
+ return AVERROR_INVALIDDATA;
- if (st->codecpar->channels == 2)
- st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
- else if (st->codecpar->channels == 1)
- st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
+ if (par->channels == 2)
+ par->channel_layout = AV_CH_LAYOUT_STEREO;
+ else if (par->channels == 1)
+ par->channel_layout = AV_CH_LAYOUT_MONO;
else
return AVERROR_INVALIDDATA;
- st->codecpar->format = AV_SAMPLE_FMT_S16;
- st->codecpar->bits_per_raw_sample = 16;
- st->codecpar->bit_rate = st->codecpar->channels *
- st->codecpar->sample_rate *
- st->codecpar->bits_per_coded_sample;
+ par->codec_type = AVMEDIA_TYPE_AUDIO;
+ par->codec_id = AV_CODEC_ID_ADPCM_IMA_APM;
+ par->format = AV_SAMPLE_FMT_S16;
+ par->bits_per_raw_sample = 16;
+ par->bit_rate = par->channels *
+ par->sample_rate *
+ par->bits_per_coded_sample;
- if ((ret = avio_read(s->pb, buf, APM_VS12_CHUNK_SIZE)) < 0)
+ if ((ret = avio_read(s->pb, buf, APM_FILE_EXTRADATA_SIZE)) < 0)
return ret;
- else if (ret != APM_VS12_CHUNK_SIZE)
+ else if (ret != APM_FILE_EXTRADATA_SIZE)
return AVERROR(EIO);
- apm_parse_vs12(&vs12, buf);
+ apm_parse_extradata(&extradata, buf);
- if (vs12.magic != APM_TAG_VS12) {
+ if (extradata.magic != APM_TAG_VS12 || extradata.data != APM_TAG_DATA)
return AVERROR_INVALIDDATA;
- }
- if (vs12.state.has_saved) {
+ if (extradata.state.has_saved) {
avpriv_request_sample(s, "Saved Samples");
return AVERROR_PATCHWELCOME;
}
- if (avio_rl32(s->pb) != APM_TAG_DATA)
- return AVERROR_INVALIDDATA;
-
- if ((ret = ff_alloc_extradata(st->codecpar, 16)) < 0)
+ if ((ret = ff_alloc_extradata(par, APM_EXTRADATA_SIZE)) < 0)
return ret;
- AV_WL32(st->codecpar->extradata + 0, vs12.state.predictor_l);
- AV_WL32(st->codecpar->extradata + 4, vs12.state.step_index_l);
- AV_WL32(st->codecpar->extradata + 8, vs12.state.predictor_r);
- AV_WL32(st->codecpar->extradata + 12, vs12.state.step_index_r);
+ /* Use the entire state as extradata. */
+ memcpy(par->extradata, buf + 20, APM_EXTRADATA_SIZE);
- avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
+ avpriv_set_pts_info(st, 64, 1, par->sample_rate);
st->start_time = 0;
- st->duration = vs12.data_size *
- (8 / st->codecpar->bits_per_coded_sample) /
- st->codecpar->channels;
+ st->duration = extradata.data_size *
+ (8 / par->bits_per_coded_sample) /
+ par->channels;
return 0;
}
return 0;
}
-AVInputFormat ff_apm_demuxer = {
+const AVInputFormat ff_apm_demuxer = {
.name = "apm",
.long_name = NULL_IF_CONFIG_SMALL("Ubisoft Rayman 2 APM"),
.read_probe = apm_probe,
.read_header = apm_read_header,
.read_packet = apm_read_packet
};
+#endif
+
+#if CONFIG_APM_MUXER
+static int apm_write_init(AVFormatContext *s)
+{
+ AVCodecParameters *par;
+
+ if (s->nb_streams != 1) {
+ av_log(s, AV_LOG_ERROR, "APM files have exactly one stream\n");
+ return AVERROR(EINVAL);
+ }
+
+ par = s->streams[0]->codecpar;
+
+ if (par->codec_id != AV_CODEC_ID_ADPCM_IMA_APM) {
+ av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
+ avcodec_get_name(par->codec_id));
+ return AVERROR(EINVAL);
+ }
+
+ if (par->channels > 2) {
+ av_log(s, AV_LOG_ERROR, "APM files only support up to 2 channels\n");
+ return AVERROR(EINVAL);
+ }
+
+ if (par->sample_rate > (INT_MAX / 8)) {
+ av_log(s, AV_LOG_ERROR, "Sample rate too large\n");
+ return AVERROR(EINVAL);
+ }
+
+ if (par->extradata_size != APM_EXTRADATA_SIZE) {
+ av_log(s, AV_LOG_ERROR, "Invalid/missing extradata\n");
+ return AVERROR(EINVAL);
+ }
+
+ if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
+ av_log(s, AV_LOG_ERROR, "Stream not seekable, unable to write output file\n");
+ return AVERROR(EINVAL);
+ }
+
+ return 0;
+}
+
+static int apm_write_header(AVFormatContext *s)
+{
+ uint8_t buf[APM_FILE_EXTRADATA_SIZE] = { 0 };
+ AVCodecParameters *par = s->streams[0]->codecpar;
+
+ /*
+ * Bodge a WAVEFORMATEX manually, ff_put_wav_header() can't
+ * be used because of the extra 2 bytes.
+ */
+ avio_wl16(s->pb, APM_TAG_CODEC);
+ avio_wl16(s->pb, par->channels);
+ avio_wl32(s->pb, par->sample_rate);
+ /* This is the wrong calculation, but it's what the orginal files have. */
+ avio_wl32(s->pb, par->sample_rate * par->channels * 2);
+ avio_wl16(s->pb, par->block_align);
+ avio_wl16(s->pb, par->bits_per_coded_sample);
+ avio_wl32(s->pb, APM_FILE_EXTRADATA_SIZE);
+
+ /*
+ * Build the extradata. Assume the codec's given us correct data.
+ * File and data sizes are fixed later.
+ */
+ AV_WL32(buf + 0, APM_TAG_VS12); /* magic */
+ AV_WL32(buf + 12, 0xFFFFFFFF); /* unk1 */
+ memcpy( buf + 20, par->extradata, APM_EXTRADATA_SIZE);
+ AV_WL32(buf + 76, APM_TAG_DATA); /* data */
+
+ avio_write(s->pb, buf, APM_FILE_EXTRADATA_SIZE);
+ return 0;
+}
+
+static int apm_write_trailer(AVFormatContext *s)
+{
+ int64_t file_size, data_size;
+
+ file_size = avio_tell(s->pb);
+ data_size = file_size - (APM_FILE_HEADER_SIZE + APM_FILE_EXTRADATA_SIZE);
+
+ if (file_size >= UINT32_MAX) {
+ av_log(s, AV_LOG_ERROR,
+ "Filesize %"PRId64" invalid for APM, output file will be broken\n",
+ file_size);
+ return AVERROR(ERANGE);
+ }
+
+ avio_seek(s->pb, 24, SEEK_SET);
+ avio_wl32(s->pb, (uint32_t)file_size);
+ avio_wl32(s->pb, (uint32_t)data_size);
+
+ return 0;
+}
+
+const AVOutputFormat ff_apm_muxer = {
+ .name = "apm",
+ .long_name = NULL_IF_CONFIG_SMALL("Ubisoft Rayman 2 APM"),
+ .extensions = "apm",
+ .audio_codec = AV_CODEC_ID_ADPCM_IMA_APM,
+ .video_codec = AV_CODEC_ID_NONE,
+ .init = apm_write_init,
+ .write_header = apm_write_header,
+ .write_packet = ff_raw_write_packet,
+ .write_trailer = apm_write_trailer
+};
+#endif
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