mirror of https://git.ffmpeg.org/ffmpeg.git
lavc/tta: Add support for encrypted streams
Signed-off-by: James Almer <jamrial@gmail.com> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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a63dc846b5
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0957041221
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@ -34,6 +34,8 @@
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#include "get_bits.h"
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#include "internal.h"
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#include "libavutil/crc.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/opt.h"
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#define FORMAT_SIMPLE 1
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#define FORMAT_ENCRYPTED 2
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@ -57,6 +59,7 @@ typedef struct TTAChannel {
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} TTAChannel;
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typedef struct TTAContext {
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AVClass *class;
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AVCodecContext *avctx;
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AVFrame frame;
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GetBitContext gb;
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@ -68,6 +71,8 @@ typedef struct TTAContext {
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int32_t *decode_buffer;
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uint8_t crc_pass[8];
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uint8_t *pass;
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TTAChannel *ch_ctx;
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} TTAContext;
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@ -93,8 +98,13 @@ static const int32_t ttafilter_configs[4] = {
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12
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};
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static void ttafilter_init(TTAFilter *c, int32_t shift) {
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static void ttafilter_init(TTAContext *s, TTAFilter *c, int32_t shift) {
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memset(c, 0, sizeof(TTAFilter));
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if (s->pass) {
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int i;
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for (i = 0; i < 8; i++)
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c->qm[i] = sign_extend(s->crc_pass[i], 8);
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}
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c->shift = shift;
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c->round = shift_1[shift-1];
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// c->round = 1 << (shift - 1);
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@ -173,6 +183,21 @@ static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size)
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return 0;
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}
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static uint64_t tta_check_crc64(uint8_t *pass)
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{
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uint64_t crc = UINT64_MAX, poly = 0x42F0E1EBA9EA3693U;
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uint8_t *end = pass + strlen(pass);
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int i;
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while (pass < end) {
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crc ^= (uint64_t)*pass++ << 56;
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for (i = 0; i < 8; i++)
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crc = (crc << 1) ^ (poly & (((int64_t) crc) >> 63));
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}
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return crc ^ UINT64_MAX;
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}
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static av_cold int tta_decode_init(AVCodecContext * avctx)
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{
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TTAContext *s = avctx->priv_data;
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@ -201,8 +226,11 @@ static av_cold int tta_decode_init(AVCodecContext * avctx)
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return AVERROR_INVALIDDATA;
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}
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if (s->format == FORMAT_ENCRYPTED) {
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av_log_missing_feature(avctx, "Encrypted TTA", 0);
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return AVERROR_PATCHWELCOME;
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if (!s->pass) {
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av_log(avctx, AV_LOG_ERROR, "Missing password for encrypted stream. Please use the -password option\n");
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return AVERROR(EINVAL);
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}
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AV_WL64(s->crc_pass, tta_check_crc64(s->pass));
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}
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avctx->channels = s->channels = get_bits(&s->gb, 16);
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if (s->channels > 1 && s->channels < 9)
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@ -321,7 +349,7 @@ static int tta_decode_frame(AVCodecContext *avctx, void *data,
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// init per channel states
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for (i = 0; i < s->channels; i++) {
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s->ch_ctx[i].predictor = 0;
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ttafilter_init(&s->ch_ctx[i].filter, ttafilter_configs[s->bps-1]);
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ttafilter_init(s, &s->ch_ctx[i].filter, ttafilter_configs[s->bps-1]);
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rice_init(&s->ch_ctx[i].rice, 10, 10);
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}
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@ -465,6 +493,20 @@ static av_cold int tta_decode_close(AVCodecContext *avctx) {
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return 0;
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}
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#define OFFSET(x) offsetof(TTAContext, x)
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#define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)
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static const AVOption options[] = {
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{ "password", "Set decoding password", OFFSET(pass), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC },
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{ NULL },
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};
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static const AVClass tta_decoder_class = {
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.class_name = "TTA Decoder",
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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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AVCodec ff_tta_decoder = {
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.name = "tta",
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.type = AVMEDIA_TYPE_AUDIO,
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@ -475,4 +517,5 @@ AVCodec ff_tta_decoder = {
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.decode = tta_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
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.priv_class = &tta_decoder_class,
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};
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@ -30,7 +30,7 @@
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#define LIBAVCODEC_VERSION_MAJOR 54
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#define LIBAVCODEC_VERSION_MINOR 91
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#define LIBAVCODEC_VERSION_MICRO 102
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#define LIBAVCODEC_VERSION_MICRO 103
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#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
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LIBAVCODEC_VERSION_MINOR, \
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