Add libnut support until ffmpeg gets an independant and complete de/muxer for NUT

Originally committed as revision 6977 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 308 insertions, 0 deletions

diff --git a/libavformat/libnut.c b/libavformat/libnut.c
new file mode 100644
index 0000000000..9a2fbd47ba
--- /dev/null
+++ b/libavformat/libnut.c
@@ -0,0 +1,308 @@
+#include "avformat.h"
+#include "riff.h"
+#include "nut.h"
+
+#define ID_STRING "nut/multimedia container"
+#define ID_LENGTH (strlen(ID_STRING) + 1)
+
+typedef struct {
+    nut_context_t * nut;
+    nut_stream_header_t * s;
+} NUTContext;
+
+static const CodecTag nut_tags[] = {
+    { CODEC_ID_MPEG4,  MKTAG('m', 'p', '4', 's') },
+    { CODEC_ID_MP3,    MKTAG('m', 'p', '3', ' ') },
+    { CODEC_ID_VORBIS, MKTAG('v', 'r', 'b', 's') },
+    { 0, 0 },
+};
+
+#ifdef CONFIG_MUXERS
+frame_table_input_t ft_default[] = {
+    // There must be atleast this safety net:
+    //{ 4128,      3,   0,   1,      0,    0,     0 },
+    //{ flag, fields, pts, mul, stream, size, count }
+      { 8192,      0,   0,   1,      0,    0,     0 }, // invalid 0x00
+      {   56,      0,   0,   1,      0,    0,     0 }, // safety net non key frame
+      {   56,      0,   0,   1,      0,    0,     0 }, // safety net key frame
+      { 4128,      0,   0,   1,      0,    0,     0 }, // one more safety net
+      {   27,      0,   0,   1,      0,    0,     0 }, // EOR frame
+      {    1,      4,   1, 337,      1,  336,     0 }, // used 82427 times
+      {    1,      4,   1, 385,      1,  384,     0 }, // used 56044 times
+      {    0,      4,   2,   7,      0,    6,     0 }, // used 20993 times
+      {    0,      4,   1,   7,      0,    6,     0 }, // used 10398 times
+      {    1,      4,   1, 481,      1,  480,     0 }, // used 3527 times
+      {    1,      4,   1, 289,      1,  288,     0 }, // used 2042 times
+      {    1,      4,   1, 577,      1,  576,     0 }, // used 1480 times
+      {    1,      4,   1, 673,      1,  672,     0 }, // used 862 times
+      {    1,      4,   1, 769,      1,  768,     0 }, // used 433 times
+      {    1,      4,   1, 961,      1,  960,     0 }, // used 191 times
+      {   32,      3,   2, 101,      0,    0,     0 }, // "1.2.0" => 14187
+      {   32,      3,  -1,  40,      0,    0,     0 }, // "1.-1.0" => 5707
+      {   32,      3,   1,  81,      0,    0,     0 }, // "1.1.0" => 11159
+      {   33,      3,   1,  11,      0,    0,     0 }, // "1.1.1" => 1409
+      {  105,      3,   0,   6,      0,    0,     0 }, // checksum for video
+      { 8192,      2,   0,   1,      0,    0,     0 }, // invalid 0xFF
+      {   -1,      0,   0,   0,      0,    0,     0 }, // end
+};
+
+static int av_write(void * h, size_t len, const uint8_t * buf) {
+    ByteIOContext * bc = h;
+    put_buffer(bc, buf, len);
+    //put_flush_packet(bc);
+    return len;
+}
+
+static int nut_write_header(AVFormatContext * avf) {
+    NUTContext * priv = avf->priv_data;
+    ByteIOContext * bc = &avf->pb;
+    nut_muxer_opts_t mopts = {
+        .output = {
+            .priv = bc,
+            .write = av_write,
+        },
+        .alloc = { av_malloc, av_realloc, av_free },
+        .write_index = 1,
+        .realtime_stream = 0,
+        .max_distance = 32768,
+        .fti = ft_default
+    };
+    nut_stream_header_t * s;
+    int i;
+
+    priv->s = s = av_mallocz((avf->nb_streams + 1) * sizeof*s);
+
+    for (i = 0; i < avf->nb_streams; i++) {
+        AVCodecContext * codec = avf->streams[i]->codec;
+        int j;
+        int fourcc = 0;
+        int nom, denom, ssize;
+
+        s[i].type = codec->codec_type == CODEC_TYPE_VIDEO ? NUT_VIDEO_CLASS : NUT_AUDIO_CLASS;
+
+        if (codec->codec_tag) fourcc = codec->codec_tag;
+        else fourcc = codec_get_tag(nut_tags, codec->codec_id);
+
+        if (!fourcc) {
+            if (codec->codec_type == CODEC_TYPE_VIDEO) fourcc = codec_get_bmp_tag(codec->codec_id);
+            if (codec->codec_type == CODEC_TYPE_AUDIO) fourcc = codec_get_wav_tag(codec->codec_id);
+        }
+
+        s[i].fourcc_len = 4;
+        s[i].fourcc = av_malloc(s[i].fourcc_len);
+        for (j = 0; j < s[i].fourcc_len; j++) s[i].fourcc[j] = (fourcc >> (j*8)) & 0xFF;
+
+        ff_parse_specific_params(codec, &nom, &ssize, &denom);
+        av_set_pts_info(avf->streams[i], 60, denom, nom);
+
+        s[i].time_base.nom = denom;
+        s[i].time_base.den = nom;
+
+        s[i].fixed_fps = 0;
+        s[i].decode_delay = codec->has_b_frames;
+        s[i].codec_specific_len = codec->extradata_size;
+        s[i].codec_specific = codec->extradata;
+
+        if (codec->codec_type == CODEC_TYPE_VIDEO) {
+            s[i].width = codec->width;
+            s[i].height = codec->height;
+            s[i].sample_width = 0;
+            s[i].sample_height = 0;
+            s[i].colorspace_type = 0;
+        } else {
+            s[i].samplerate_nom = codec->sample_rate;
+            s[i].samplerate_denom = 1;
+            s[i].channel_count = codec->channels;
+        }
+    }
+
+    s[avf->nb_streams].type = -1;
+    priv->nut = nut_muxer_init(&mopts, s, NULL);
+
+    return 0;
+}
+
+static int nut_write_packet(AVFormatContext * avf, AVPacket * pkt) {
+    NUTContext * priv = avf->priv_data;
+    nut_packet_t p;
+
+    p.len = pkt->size;
+    p.stream = pkt->stream_index;
+    p.pts = pkt->pts;
+    p.flags = pkt->flags & PKT_FLAG_KEY ? NUT_FLAG_KEY : 0;
+    p.next_pts = 0;
+
+    nut_write_frame_reorder(priv->nut, &p, pkt->data);
+
+    return 0;
+}
+
+static int nut_write_trailer(AVFormatContext * avf) {
+    ByteIOContext * bc = &avf->pb;
+    NUTContext * priv = avf->priv_data;
+    int i;
+
+    nut_muxer_uninit_reorder(priv->nut);
+    put_flush_packet(bc);
+
+    for(i = 0; priv->s[i].type != -1; i++ ) av_freep(&priv->s[i].fourcc);
+    av_freep(&priv->s);
+
+    return 0;
+}
+
+AVOutputFormat nut_muxer = {
+    "nut",
+    "nut format",
+    "video/x-nut",
+    "nut",
+    sizeof(NUTContext),
+    CODEC_ID_VORBIS,
+    CODEC_ID_MPEG4,
+    nut_write_header,
+    nut_write_packet,
+    nut_write_trailer,
+    .flags = AVFMT_GLOBALHEADER,
+};
+#endif //CONFIG_MUXERS
+
+static int nut_probe(AVProbeData *p) {
+    if (p->buf_size >= ID_LENGTH && !memcmp(p->buf, ID_STRING, ID_LENGTH)) return AVPROBE_SCORE_MAX;
+
+    return 0;
+}
+
+static size_t av_read(void * h, size_t len, uint8_t * buf) {
+    ByteIOContext * bc = h;
+    return get_buffer(bc, buf, len);
+}
+
+static off_t av_seek(void * h, long long pos, int whence) {
+    ByteIOContext * bc = h;
+    if (whence == SEEK_END) {
+        pos = url_fsize(bc) + pos;
+        whence = SEEK_SET;
+    }
+    return url_fseek(bc, pos, whence);
+}
+
+static int nut_read_header(AVFormatContext * avf, AVFormatParameters * ap) {
+    NUTContext * priv = avf->priv_data;
+    ByteIOContext * bc = &avf->pb;
+    nut_demuxer_opts_t dopts = {
+        .input = {
+            .priv = bc,
+            .seek = av_seek,
+            .read = av_read,
+            .eof = NULL,
+            .file_pos = 0,
+        },
+        .alloc = { av_malloc, av_realloc, av_free },
+        .read_index = 1
+    };
+    nut_context_t * nut = priv->nut = nut_demuxer_init(&dopts);
+    nut_stream_header_t * s;
+    int ret, i;
+
+    if ((ret = nut_read_headers(nut, &s, NULL))) {
+        if (ret < 0) av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(-ret));
+        nut_demuxer_uninit(nut);
+        return -1;
+    }
+
+    priv->s = s;
+
+    for (i = 0; s[i].type != -1 && i < 2; i++) {
+        AVStream * st = av_new_stream(avf, i);
+        int j;
+
+        for (j = 0; j < s[i].fourcc_len && j < 8; j++) st->codec->codec_tag |= s[i].fourcc[j]<<(j*8);
+
+        st->codec->has_b_frames = s[i].decode_delay;
+
+        st->codec->extradata_size = s[i].codec_specific_len;
+        if (st->codec->extradata_size) {
+            st->codec->extradata = av_mallocz(st->codec->extradata_size);
+            memcpy(st->codec->extradata, s[i].codec_specific, st->codec->extradata_size);
+        }
+
+        av_set_pts_info(avf->streams[i], 60, s[i].time_base.nom, s[i].time_base.den);
+        st->start_time = 0;
+        st->duration = s[i].max_pts;
+
+        st->codec->codec_id = codec_get_id(nut_tags, st->codec->codec_tag);
+
+        switch(s[i].type) {
+        case NUT_AUDIO_CLASS:
+            st->codec->codec_type = CODEC_TYPE_AUDIO;
+            if (st->codec->codec_id == CODEC_ID_NONE) st->codec->codec_id = codec_get_wav_id(st->codec->codec_tag);
+
+            st->codec->channels = s[i].channel_count;
+            st->codec->sample_rate = s[i].samplerate_nom / s[i].samplerate_denom;
+            break;
+        case NUT_VIDEO_CLASS:
+            st->codec->codec_type = CODEC_TYPE_VIDEO;
+            if (st->codec->codec_id == CODEC_ID_NONE) st->codec->codec_id = codec_get_bmp_id(st->codec->codec_tag);
+
+            st->codec->width = s[i].width;
+            st->codec->height = s[i].height;
+            st->codec->sample_aspect_ratio.num = s[i].sample_width;
+            st->codec->sample_aspect_ratio.den = s[i].sample_height;
+            break;
+        }
+        if (st->codec->codec_id == CODEC_ID_NONE) av_log(avf, AV_LOG_ERROR, "Unknown codec?!\n");
+    }
+
+    return 0;
+}
+
+static int nut_read_packet(AVFormatContext * avf, AVPacket * pkt) {
+    NUTContext * priv = avf->priv_data;
+    nut_packet_t pd;
+    int ret;
+
+    while ((ret = nut_read_next_packet(priv->nut, &pd)) < 0)
+        av_log(avf, AV_LOG_ERROR, " NUT error: %s\n", nut_error(-ret));
+
+    if (ret || av_new_packet(pkt, pd.len) < 0) return -1;
+
+    if (pd.flags & NUT_FLAG_KEY) pkt->flags |= PKT_FLAG_KEY;
+    pkt->pts = pd.pts;
+    pkt->stream_index = pd.stream;
+    pkt->pos = url_ftell(&avf->pb);
+
+    ret = nut_read_frame(priv->nut, &pd.len, pkt->data);
+
+    return ret;
+}
+
+static int nut_read_seek(AVFormatContext * avf, int stream_index, int64_t target_ts, int flags) {
+    NUTContext * priv = avf->priv_data;
+    int active_streams[] = { stream_index, -1 };
+    double time_pos = target_ts * priv->s[stream_index].time_base.nom / (double)priv->s[stream_index].time_base.den;
+
+    if (nut_seek(priv->nut, time_pos, 2*!(flags & AVSEEK_FLAG_BACKWARD), active_streams)) return -1;
+
+    return 0;
+}
+
+static int nut_read_close(AVFormatContext *s) {
+    NUTContext * priv = s->priv_data;
+
+    nut_demuxer_uninit(priv->nut);
+    av_free(priv->s);
+
+    return 0;
+}
+
+AVInputFormat nut_demuxer = {
+    "nut",
+    "nut format",
+    sizeof(NUTContext),
+    nut_probe,
+    nut_read_header,
+    nut_read_packet,
+    nut_read_close,
+    nut_read_seek,
+    .extensions = "nut",
+};